Originally Posted by
Mywncmtns
I would occasionally rest that knob and turn the a-j knob. I must not have gotten the a-J knob fully back in place (I've realized by reading here), before I pulled on that inner knob to move right side... Because both knobs are jammed. I can't push/pull either and no movement. Have I hopelessly jammed things? I ordered tri-flow but for now have put oil in all the described places. Any advice is so appreciated or guidance to another thread. Thanks.
I like Tri-flow, but it is only an oil. Hopefully the oil you used is a clear sewing machine oil and not 3 in one household oil. You could try a little kerosene to clean the "stacks" where the movement needs to happen. Cleaning is usually needed to de-gunk the old dried oil first and then after cleaning you want to use new oil.
With my own 401A, I move the first knob to B before I can move the other knob. You might try that and see if it works the same for yours.