Quote Originally Posted by Hsing-ee View Post
I don't think he does, I think you could just use a shoulder bolt and a nut. Bowkett may have used the HW bolt, which is wider and so some machining is needed. The lock-up on the Meteor is OK, the jaws will spread if you over-tighten the stock bolts or if they see heavy use, the trick is to squeeze them back into alignment with a padded vice with the barrel out. The actual jaws are hollow so you can't thread them, you have to use a bolt and nut.

Mercuries can be retro fitted with a Mercury-S bolt and nut but also need some machining.

If you read the first four sentences of the text alongside the photo you will see that he did in fact thread the one jaw and the reason why.