Can anyone inform me as to the correct repair to make to the mount for a mirror on a 1967 R27? The mirror goes into the hole on the handlebar switch assembly, but the threads are too worn to hold it. It appears to be 8mm, but the threading is smaller than that of a 8mm x .125 helicoil kit that I have. I got the bike last fall, and was given the mirror along with other parts and I assume it is the original mirror for the bike. Thanks for any assistance.