might try a couple of things... 1) put a lock washer under the bolt head... 2) stick a screwdriver or something in there to jam that bolt head in place. 3) use socket head cap screws... Uses an allen wrench on the inside instead of a box end or combination wrench on the outside... SHCS's are also a grade 8 fastener.. unless you get it in stainless...
So long as you have any "cushion" in that clamping setup the fastener is going to loosen itself....
I reckon you are using a hex head... originally I am pretty sure it came with big square headed bolts...
A photo or two here wouldn't hurt...
This post was edited by Rootsy at 06:27:47 05/19/09.
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