> A 4 degree tilt (hard to avoid by hand) will produce a "crater" which > is 3.2mm diameter in 3mm thick material. The centre will nominally > still be almost only 3mm (oval projection of drill is slightly larger) > but in practice it works if "enough" angle is used. Real machinists > and people with a full set of drills are now rising up in fury :-).. Somehow I think solarwind will be better off using a 1/8" drill, which is quite possibly more easily obtainable in a nearby hardware store than a 3mm or 3.2mm. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .