Before any changes are made to the original 197 rotating mechanism, it might pay to try the following:
Find a drill bit that just fits the hole in the center of the magnet.
Use it as a reamer to clean out all the accumulated muck and rust by either turning the bit in the hole with your fingers or a pin vise. (I would recommend against using a power tool). Again, the idea is to clean out the hole, not make it any larger.
Clean off the pin.
A tiny bit of dry lubricant would be OK, I use Dri-Slide.
I find that this usually will get accessories with this sort of mechanism working well.
