Rod End Tap-Drill Centring Guide
A three-station drill guide for putting a centred tap hole in the end of round stock. Slip the cut end of a 6 mm rod (M3, 2.5 mm drill) or an 8 mm rod (M4, 3.3 mm drill, or M5, 4.2 mm drill) into a 20 mm-deep socket, then drill through the coaxial 14 mm-long guide bore. You end up with steel or aluminium standoffs and axles tapped on-centre. The block is 64 x 24 x 34 mm, and dimples on top (1, 2 or 3 dots) mark each station.
tool drill-guide tapping 8mm-rod