Drilling the hole for the spring and detent for the front upper to lower pin has been my nemesis. I'm one for three right now. The lower is too long to fit in my Mini mill standing on end, so I have to use the drill press. I've center punched the start point, etc. and started the hole with the bit as far up in the chuck as possible to limit flexing and walking, but I'm still having trouble getting the piece clamped well enough to keep from moving during drilling, and it's been a bear getting the hole to stay centered and straight. Any advice or tips would be MUCH appreciated!
P.S. to salvage the two that got goofed up, I milled off the raised rib area back past the end of where the detent spring bottomed out and I am going to try tig welding a piece of 1/4 inch aluminum rod, same alloy, ground flat on a side to match the profile of the rib, to the area where the rib used to be. In essence I'm making a replacement rib. I may even make up the piece pre-drilled before I weld it in place.