Quote Originally Posted by biketrialsdave View Post
I think that looks like the best solution. There 20mm so 8.4mm thickness left according to solidworks. Now the question is, do I attempt to drill them out and re-bore myself or send them back and get them re-done professionally? I'm worried about the drill bit wandering off from centre.

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Well that's up to you! My build has been decidedly diy so I'd have to do it myself! I would have thought the bit would find its centre in the existing hole...