How to Remove the Balance Wheel off of Model 12
I'm trying to remove the balance wheel from my machine. It is the type where it has the pull and twist knob and the notch fits into the slots. I understand that the "middle ring" has to be twisted clock-wise to unscrew it. I've applied heat and two different penetrating oils to it. The notch to tap on is in an awkward position and I can't get the ring to budge. Surely, when Singer designed this thing, that workers were not using a hammer and some kind of small bar to unscrew this thing. Did they have a special tool that could latch into the notch that allowed them to unscrew it?