interesting, would of never occurred to me to mess with that piece. I sent mantis a message asking about that, didn't make sense since both assemblies looked almost identical. I still might just grab a slightly more powerful coil just in case.

I wrote Kerry the guy who made these new assemblies and what he said makes sense. The old assemblies are made out of plated steel, a more ferrous metal, which in conjunction with the coil adds to the electromagnetism when its energized. The new ones are made out of stainless steel a tougher material in general, but not ferrous. i.e. why you might need a stronger coil. I've found that even coils of the same model have a different resistance (which might of played a role on your machine?), usually not off by much.

I looked for the adjustment you were referring to, was thinking maybe the trap door part could be moved up or down. Wasn't able to find anything though.