How do I remove these? Cap shroud mast-fixings

The fittings are the same on each side.

Sadly, there isn't a Javelin30 Owners Association. I am sure the spars (mast, boom, spinnaker pole) are Proctor which means that no factory advice could be available.

I think it is a case of the "through-mast fittings", (bolt and compression prevention sleeve/tube) having corroded together.
My experience of s/s and alloy corroding in this way means it's a cutting-job rather than detaching.

I'm in touch with Sailspar who seem to be offering relevant advice and bespoke re-manufacture.

£££s ??? Who knows?:(

Thanks for your response

RW
 
Nothing inside the "tube"?? Just wondering if the lip on the outside is either side of a fitting that screws together, but inside the compression tube... I'm only guessing.... PVB's I understand, but all I can think of is a screw thread inside the mast for holding yours together ... kind of like a bigger version of this?

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Fantasie 19 said:
Nothing inside the "tube"?? Just wondering if the lip on the outside is either side of a fitting that screws together, but inside the compression tube... I'm only guessing.... PVB's I understand, but all I can think of is a screw thread inside the mast for holding yours together ... kind of like a bigger version of this?

00160030000_720x600.png
Click to expand...

That's something that concerned me. So I've given up on trying to mechanically undoing the assembly and have decided to grind-off the external bits, and at worst have to buy a whole new assembly.

Boat - Bring On Another Thousand !!
 
As others have said, I would drill out the rivets and then I wouldn't be surprised if the assembly could be lifted ( or prised) off the tube after applying some PlusGas or similar.
 
parsifal said:
As others have said, I would drill out the rivets and then I wouldn't be surprised if the assembly could be lifted ( or prised) off the tube after applying some PlusGas or similar.
Click to expand...

But what is the purpose of the tube through the mast if that's the case? It's usually to stop compression when there's a nut and bolt holding the tang fittings on.
 
pvb said:
But what is the purpose of the tube through the mast if that's the case? It's usually to stop compression when there's a nut and bolt holding the tang fittings on.
Click to expand...
Perhaps I have misunderstood but when the OP wrote "I have removed the pin", I assumed he was referring to the length off s/s bar with a thread on each end that passes through the sleeve and has a nut on each end. That's the arrangement on my mast.
 
parsifal said:
Perhaps I have misunderstood but when the OP wrote "I have removed the pin", I assumed he was referring to the length off s/s bar with a thread on each end that passes through the sleeve and has a nut on each end. That's the arrangement on my mast.
Click to expand...

That's what I have, and have done. The s/s bar with threads and nuts on both ends is now removed, leaving the tang fittings still held in place by what look like s/s "caps" - which themselves have the internal compression sleeve/tube immovably joined to them (corrosion, perhaps, or threaded ends).. The riveted plates seem to be there only to locate the "through assembly" and spread the loadings.

So I am going to have to grind-off one of the "caps" flush with the mast-face and hope the assembly will slide out the other side of the mast.

Of course, if it doesn't slide out and there is some other mysterious snag holding them together, then I'm well and truly up a gumtree.
I shall be attempting to task in about two hours time, when I've had yet another inspection and "think".

Report will be issued later today. Edge of seat stuff, eh !!
 
I would drill out the rivets on at least one side, long before I would think about grinding off any caps.
 
NormanS said:
I would drill out the rivets on at least one side, long before I would think about grinding off any caps.
Click to expand...
Absolutely agree!

I'm sure that the tang fittings are simply pushed onto the ends of the compression sleeves and are not threaded. Why would the mast builder add unecessary complexity (and thereby increase his costs) by threading the ends of the compression sleeve? There would be nothing gained by so doing.
 
NormanS said:
I would drill out the rivets on at least one side, long before I would think about grinding off any caps.
Click to expand...

I concur with your caution, but surely drilling out the rivets will not affect the "through fixing"?
Unless the "caps" are part of and/or fixed to the riveted plate. That is something I had not thought of, and I may well be thanking you most heartily later this morning.
So if I understand you correctly, the "caps" may not be corroded into the compression sleeve/tube but are held solidly in place by the riveted plates, either side of the mast.
The removal of the plates may remove the caps from the mast AND release them from the internal tube?
 
parsifal said:
Absolutely agree!

I'm sure that the tang fittings are simply pushed onto the ends of the compression sleeves and are not threaded. Why would the mast builder add unecessary complexity (and thereby increase his costs) by threading the ends of the compression sleeve? There would be nothing gained by so doing.
Click to expand...

Thank you.
See above reply to Norman S.

Inexpensive progress may be about to happen.
Fingers crossed.
 
parsifal said:
As others have said, I would drill out the rivets and then I wouldn't be surprised if the assembly could be lifted ( or prised) off the tube after applying some PlusGas or similar.
Click to expand...

Yes. The cap is essentially a big hollow rivet holding the tangs onto the mounting plate. The tube holds the two sides apart so that the necessary through bolt can be tightened without collapsing the mast. It would be virtually impossible to assemble if the tube were threaded.

I have looked carefully at the first picture but i can't work out where the tube diam. ends and the cap begins. There are any number of ways (slow but cheap) of releasing the tube particularly as its scrap anyway.

IMO because i am not there:)
 
Well folks, the job is done.

BUT,

drilling the rivets and loosening the plate(s), then using "persuasion" of the liquid and heavy-metal kind, nothing shifted.
So I was forced to grind off one of the "caps".

This done the whole assembly, including the compression tube slid out.

There is absolutely no way that tube would have released from the caps, short of a cruise missile. Even in the vise in the garage there wasn't a micron of movement.

So, its a whole new assembly - with peace of mind.

Plenty of pics taken at various stages, the best of which I'll upload later.

Time for a bowl of soup :D, and a look at my bank statement........:(

Thanks for all your comments.:encouragement:

RW

PS, boiling water, Plusgas etcwould not have helped much as the cuts in the compression tube were extensive so the liquids would not have stayed in the tube.
I now know that the damage has been done over a long time, possibly since new in 1980 !!!
 
Thinking of how it was made -I would have a tube through the mast turned down for 7-8mm where it goes through the tang. The shoulder on the tube fits behind the tang level with face of mast. Then by fitting a bolt through the assembly & tightening ( possibly a hydraulic draw bar) with a rounded former each end the end would be riveted over the tangs. That way they are held apart to avoid mast compression but the tang securely fastened. To stop wear on the side of the hole during use the tang extends up & is riveted to the mast. The additional bolt stops the tang pulling free in the event of end failure of the tube which will be quite thin
I would still think the tube needs drilling- not grinding on the face). This could be with a large countersink drill that would self align in the hole & take out the side of the tube where it passes through the tang. You could try a tapered drill bit as well so it does not wander about when drilling. The actual outer face of the riveted bit will fall away like a washer

The end of the tube looks just like the clew on my mainsail where the sailmaker has passed a riveted ring through & belled the end outwards

My guess anyway !!
 
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Well, there you are.
I hope this clears up all your various kind suggestions. Just need to get a new assembly made up!!

Just look at the damage to the inner sleeve!!
 
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