I've heard of force fitting a British threaded cartridge bottom bracket, but I'm not going to try it on my PX10! Actually, it probably won't hurt the shell because it's steel and the BB is aluminum. It's just not the right way to do things.

I think I'm going to try an Edco from Velo Orange since I want to use a NR triple on my Peugeot. The 120mm spindle should be about right and the Edco makes the chainline adjustable to some extent.