gunrunnerjohn posted:The trick is getting the drill bit perfectly straight in the base.
I don't have the tool yet but looking at pictures it appears to have a few sizes with a wide part that fits in the screw and narrower end that fits in the gear. If thats the case its just matter of taking some bar stock , turning it down to fit the screw, then center drilling for a drill bit to fit the adapter. The bit will be centered and on axis.
Turning hard metal down to a small diameter can be tricky especially something 3/4" long. The metal wants to bend away from the cutter and hard metal shears off more easily. It would be easier on a grinding machine which is probably how the bits in this tool were made.
I did a similar thing when I made my flywheel puller but skipped the adapter and just drilled directly into the screw as I had many of those. In this case I used dowel pins instead of drill bits but drill bits use harder metal.
Pete
