RatherBusa
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The drill should be the size of the shaft of the bolt without the threads.
You need something to cut off of the aluminum sides after the drill comes out.
Practice on a piece of wood.
You can drill and tap it fine and see if it is the right size.
well, 3/8" was too big, almost fit right over the lever stem. the next best thing I have without getting too small is 5/16", but seems a pain to get started...