Apologies Mal, when Martyn offered the UK source I dropped my end of the rope.
Cannot recall the size off the top of my head, but I do remember that the set screws needed are fine thread -opposed to corse thread. Also, assuming you still have at least one present, if you remove it you'll find the point is not a point at all; either flat or a reverse cone. They need to grip the rail, not dimple/deform it.
Of course here in the Colonies we hold fast to our Standard method of measurement, not that dreadfully difficult to decipher 10 based system the entire rest of the world appears to embrace. The set screws are, indeed, Standard sizes but I don't know if there is an exact match to a Metric size.
Regardless, the little buggers are not large at all as evidenced by the fact that when they fall out they are never seen again. Clever. Very clever.
I was just looking at the WM site and it appears they are only available in bulk (100 per pack) from the web site. Once I get the WM stock number this eve I'll check again.
Dan
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