Thanks planeur
I normally use a 1 mm drill bit, which is a pretty decent sized hole for me, but on some of the things I cut when it gets really detailed I go down to 0.4 mm to give me as small an entry hole as possible. I only use that drill bit when scaling down to a 0/2 blade instead of a size 2.
Here is a pic of the drill I use, you see I have a thing against power tools when doing my fret work. I try to keep it as old school as possible. It is set up with a 1 mm bit at the moment.
Cheers and have a good one
Tony