How did you unlock your 99k? I was recently given one that seems in perfect shape, no rust, no thread and fluff. However the hand wheel is locked, it only moves with force. The problem seems to be in the arm beyond the wheel. I can get the wheel off, but from there no screw moves with any torque I am able to apply. I’ve used oil, penetrating oil, but no luck. The local sewing store charges over $100 just to look at it. Hands on care is very extra.
Any ideas?