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On 16 Jul 2001, at 19:38, Henrik Larsson wrote: > Jim Adney wrote: > > > Then make a guide that looks like a bit of tubing that fits in the > > straight part and has an ID the same as the drill you need to use. > > Get a new drill, very sharp, high speed steel, and drill using very > > LOW speed, lots of pressure, and coolant, water is fine. You just > > don't want the cutting edge to spin against the face of the old bolt > > material because that will harden it. > > Thank you for the advice! Should I start with a small drill and then use a > larger, or should I go straight for the 6 mm drill? It's hard to make the pilot drill stay centered, so you are pretty much forced to go with the full size from the start. I think 6mm sounds too small. I think these bolts were M10 x 1.5, if that is correct, then the tap drill size is 8.5mm. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org