What stops open body rigging screw undoing?

[tudorsailor]

Is it correct that the split pins through the threaded screw of a rigging screw are meant to protrude enough to stop the screw undoing? If so have learned something new!
Excuse my ignorance
TudorSailor

 

[europe172]

Yes. You could also try siezing wire.

 

[dom]

Yes that is correct and the head size is key, which must be big enough. Once the tails are bent into a neat splayed position, it is necessary to wrap waterproof tape around the turnbuckle to prevent the sharp pin tails catching anything. But make sure to leave the turnbuckle open, especially at the bottom, in order to prevent crevice corrosion.

 

[rogerthebodger]

Is it correct that the split pins through the threaded screw of a rigging screw are meant to protrude enough to stop the screw undoing? If so have learned something new!
Excuse my ignorance
TudorSailor

I have fitted short cap head set screws into the screw thread so the head prevents the rigging screw turning. This also means the open end of a split pin cannot catch on and line or sheed and damage the sheet.

 

[zoidberg]

Is it correct that the split pins through the threaded screw of a rigging screw are meant to protrude enough to stop the screw undoing? If so have learned something new!

I'd believed that the small set-screws found on/in Hasselfors open rigging screws did this well, by being partly unwound so they impinged on the main body - until after a wild night in the Celtic Sea, my mast was slamming about due to a very slack forestay. The rigging screw had almost completely unwound.

On close examination, the small set-screw on the Hasselfors on the forestay had had its head sheared and mangled, allowing the jerks and slams to cause rotation until just one or two threads still held the mast up. Never heard of that before, and it wasn't like that the previous pm. "Every day a schoolday..."

 

[TQA]

I have split rings in mine. They are large enough to prevent rotation.

 

[PuffTheMagicDragon]

I have split rings in mine. They are large enough to prevent rotation.

Me too.
However, I like Rogershaw's solution in post #4 and will think about it.

 

[neil_s]

Small tywraps work well, too. They don't need to be covered with tape, either.

 

[PeteCooper]

Me too.
However, I like Rogershaw's solution in post #4 and will think about it.

I like that as well ... and used something similar on my brother's Moody 31 ... small(3mm I think) bolts with nyloc nuts. Big enough to stop any relative motion, and small enough to be unobtrusive. For my boat I don't think there are bolts small enough

 

[PuffTheMagicDragon]

I like that as well ... and used something similar on my brother's Moody 31 ... small(3mm I think) bolts with nyloc nuts. Big enough to stop any relative motion, and small enough to be unobtrusive. For my boat I don't think there are bolts small enough

The problem with small bolts is that the core is even smaller. For an M3 bolt the core is effectively 2mm and would be more prone to snapping than a split-pin of similar dimensions.

 

[PeteCooper]

The problem with small bolts is that the core is even smaller. For an M3 bolt the core is effectively 2mm and would be more prone to snapping than a split-pin of similar dimensions.

Of course you are right ... but I am not sure it matters. The turning force will be low.

 

[BabaYaga]

There are also these:
https://www.svb24.com/en/blue-wave-smart-pins.html
and these:
https://www.svb24.com/en/sureclips-kit.html

 

[PuffTheMagicDragon]

The turning force will be low.

Yes, that is very true. I was thinking of unseen partial fracturing due to, for example, over-enthusiastic tightening and leading to failure at a later date.

 

[Quandary]

For the last few years I have been using cable ties, tempting fate I know but they only have to last 6 months as the mast comes down every winter. No failures so far.

 

[Spirit (of Glenans)]

Cable ties, renewed annually, are by far the best solution.

 

[LoneHort]

What about all that waste of plastic with annuall cable ties? Surely stainless welding rods are better like here? View attachment 70922

 

[[70521]]

Cable ties, renewed annually, are by far the best solution.

Why?

I would be concerned about UV degradation of the plastic even at these latitudes.

 

[VicS]

Why?

I would be concerned about UV degradation of the plastic even at these latitudes.

You can get UV resistant cable ties

 

[Quandary]

What about all that waste of plastic with annuall cable ties? Surely stainless welding rods are better like here? View attachment 70922

Well, perhaps I am not sufficiently concerned about our environment, but on a discontinuous rig I found the cable ties very hand when hanging out by the spreader ends and the colored plastic was easy to check visually from deck level. I probably waste more plastic making my dinner than I use on the rig in a season.

 

[Yngmar]

We've been berthed next to a boat with locknuts on their (open body) rigging screws instead of pins. We have them on the (closed body) lifeline turnbuckles, but for some reason this was the first time I've seen them on standing rigging. Perhaps not secure enough when facing vibrations?