Hello,

drill sets from 0.3mm to 1.6mm are available here for about £6 , 10 dollars. I used a 0.3 drill in a high speed dremmel drill. My conversion is wrong .3mm is .010 not .007 but it is still very small and I take your point about oil or carbon blocking the holes. I made the holes that small because I was waiting for a reply from other members about what a #60 size American notation meant and I think you will agree that it is easy to enlarge the holes rather than make them smaller. thanks for your input Regards Tony