Where to find tiny sheer pins...

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Elemental

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At least I think that's what I'd call them...

My Autohelm ST4000 wheelpilot (1994-now discontinued) broke over the weekend. After pulling it apart I have discovered that the clutch lever pivots on a SS shaft (dia about 3mm) which in turn is snugly inserted into an belt tensioning cam. There are (were /forums/images/graemlins/frown.gif ) 2 securing sheer pins that prevent the shaft from rotating in the cam. They're only about 1.3mm dia. They appear to have been in the form of a split tube (presumably to provide some diametric expansion to ensure a snug fit). Google as I might, I can't find anything like them - I'm probably googling for the wrong thing. I guess a tiny piece of solid rod (S/S ?) might fit but I can't find anything down to that diameter either.
The while thing sits inside a smooth bronze bush and so must be totally flush .

Nothing on the autohelm site and the dealers I spoke to only want to sell me a new wheelhelm...!

Is there and proper name for these things? And does anyone know where I can source two?

TIA, Mark
 
It is called a roll pin. Very hard metal and split allows them to be drifted into tight holes and not come out.

I know its money, but there is a conversion kit to upgrade to the latest wheel mechanism which is much more robust. about 2/3 price of complete new unit.
 
Split cotters - from your nearest automotive parts dealer or even Halfords. They have 'em in boxes of all random sizes and'll sell you wehatever you want. Fitted by hammer/punch.
 
I always thought cotter pins were split pins, ie fairly soft and you bent the legs over to secure them. Roll pins, selloc pins or spring pins are like a small pipe with a slot along the length, very hard and fitted / removed with a punch.
 
Ah, but I'm a Sassenach you see, and the hard rolled split tubes we call split cotters, the soft half-round bent together pins we call split pins.

What's in a name?

Like they say about us and the Yanks, two nations separated by a single language!

Whatever you call em' you can still purchase where I said in my first post which is the important info the chap needs.
 
I thought they used concrete reinforced with gold bars for the parliament building. With what it cost, I'm pretty sure they didn't use any recovered stone. Only consolation is I voted against it.
 
Googling for 'roll pins' does indeed seem to take me to the right products - many thanks. Upgrading the whole unit does seem to be a bit expensive in comparison.

Cheers

Mark
 
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