I had a bolt sheared off in my mudguard hole on the fork (have randomly forgotten what they are called). I finally (after nearly a year) managed to get the time and tools to drill it through. The original hole is obvs M4, i've drilled through with a 3mm drill.
Question is, should i try and get someone to tap the 'new' hole at either 3mm or 4mm, or am i just best off using a 3mm bolt with a nut on the inside of the fork to secure it? (or drill it through with 4mm and use 4mm bolt and nut)