I set the Pfaff aside until my replacement part for the tension arrives. In the meantime I put a Singer 201 on my table. I couldn't tell what was going on with the paint job. I figured it was the clear coat failing, but have changed my mind on that. The machine had a weird grey speckled haze but after starting the clean up I started noticing the haze was in places I never see clear coat problems. The tension piece had it, the bakelite terminal piece had it. I think now that the machine was left uncovered somewhere near where paint was being sprayed and received a light dusting.
The tension spring was a real mess. Luckily I had a spare. It also had a broken brush cap. I was able to score it well enough to get it out. The motor is currently lying in pieces but it's clean.