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Message: <blockquote data-quote="Macbuell" data-source="post: 333191" data-attributes="member: 3414"><p>Sorry, I don't have any specs. Metal was 1/8" I think. I had to grind it down a few times until I could not feel it grinding with the cover on. Still much thicker than needed. I believe I got the ID of the hole from measuring it, then subtracted 1/4" to get the 1/8" lip...might have been 1/2" to get the 1/4" lip. Either way that does not need to be precise- just dont go TOO big on the lip and you will be fine. Just trial and error with what fits. Have the bike close to a grinder and make sure you clean it very well when done before adding oil! Don't want leftover crap in there.</p></blockquote><p></p>