Some of those oil galleries from the main bearing journal to the rod journal are six inches long or more. I believe it might be necessary to make up a non-conductive guide fixture from something like Bakelite or Teflon to aim the electrode accurately, and then make a mounting jig for the electrode holder. I discussed the procedure with the owner of King's Crankasafts in North Carolina when I bought one of his retired manual crankshaft grinders a few years ago, about drilling the galleries with one of the CNC mills he uses now. He said the first one would be E$$$PENSIVE, as it would include programming the machine, but the cost for duplicates would be much less. This guy makes custom ordered NASCAR crankshafts from solid steel billets, so his idea of "less costly" might still make a restorer's checkbook need CPR!
Jerry
