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BACKGROUND (not necessary to know):
My bike's an '88 EX500.
On the back half of the left handlebar's control housing is a tab that plugs into a hole in the handlebar. This keeps the control housing from rotating. The tab has broken off and I need to replace it to keep the housing stationary.
I'm going to insert a bolt into the housing where the tab used to be. The bolt's head will plug into the hole on the handlebar. The hole is about 3mm in diameter.
I haven't been able to find a bolt with the proper-sized head diameter (it needs to be accurate or this repair won't work). I'm going to use a mild steel hex-head bolt... but the head of the bolt I'm going to use is just slightly larger than the hole. I need to grind it down about 0.5mm in diameter.
MY QUESTION (finally):
How can I grind the head of a mild steel hex-head bolt down about 0.5mm in diameter? (Or, if you read the above, do you have any other advice?)
Thanks!