Right well, the latest news.
I've been down to headshop UK, great place, the guys there are very clued up. Also saw pictures of sprokets mini up on the notice board...
He took a look at the block, and said it could be helicoiled. He asked if I was fitting a strap and if I had the bolts i was trying to use. I brought out the centre main strap and the stripped bolt. He took one look at the bolt and said 'your not using these are you' Then said 'they're not long enough, no way'
He said that the bolts i've been given with the centre main strap are way to short. He said once they've gone through the cap, the strap and the dowel on the block they only give about 6mm thread engagment. As seen in this picture below:
So he said, since these are poor quality bolts, he said theres no way so little threads could take that much torque and thats why its stripped both the bolt and the block. He measured the depth of the thread in the block at 42mm! So he said the bolts i've got should have another 30mm of thread at least!
So basically, i've tryed to put 63ft/lbs of torque on about 4 threads. He was shocked that such small and poor quality bolts had been supplied for such an important part. He said i should have some bolts that have about 40mm of thread after
the dowel in the block and should have washers, with a recess machined into the strap for the washers to sit in.
Anybody else have bolts like the ones i've got with there centre main straps?
Anybody know how long those bolts i've ordered from america are?
Edited by minimadmike, 15 June 2009 - 07:04 PM.