PB Blaster
I've had a few issues with machine knobs(plastic) being damaged by products. Specifically Liquid Wrench:< Does PB Blaster melt or damage knobs and dials? I have some Kroil on order, but was going to give the PB Blaster a shot first if it won't do damage. I have a Bernina 730 that I posted about and everything on it is good to go now except for a frozen buttonhole lever/knob. It's a common problem and I've tried a week of Triflow and hair dryer and now need to move on to bigger guns. The last time I used Liquid Wrench it didn't like the plastic. I'll wait for the Kroil if I need to...