I finally got back to work on the BH after a long layoff over Christmas.
I got four ignition switches from a friend for cheap, two Bendix and two Gerdes. Each had a little flaw, so I took them apart and made two good switches out of the four. I got new plates from Aircraft Spruce. The Bendix had overall the best parts and met the AD/Servce Bulletin requirements. The Bendix is going to a friend's project and I'm keeping the Gerdes.