I was going to drill out my IGO W tonight, and have realized that I only have a 7/64 bit. It looks like its a decent upgrade, just dont want to go to big, I see alot of people saying 2mm, 1.5mm. On google conversion chart it says 7/64 is like 2.7mm, probably going to be like .3 or .4 after build but no ohm reader to say exactly. Any advice here is greatly appreciated.