I got a swage block from Centaur Forge in as-cast condition. The holes are pretty rough, basically just cored holes to be finished. The round holes I can bore on the mill, but the square holes - yuk, I'm going to have to finish these by hand, not having a neat EDM machine or shaper or vertical slotting attachment available. Is there some kind of trick to this job? The block is 4" thick, of course, so handwork with a file is going to be a bit tedious.
Grant Erwin