For the bobbin winding problem, hubby did remove the hand wheel, oiled the shaft and wheel. We then ran it a bit, holding the take up lever to keep it from moving, removed the hand wheel again, lightly sanded the shaft (which was dry originally) , oiled, ran again, then removed the hand wheel the final time, cleaned shaft and wheel again and re-oiled. It takes very little pressure on the take up lever to stop the needle from moving up and down. He even adjusted the belt a tiny bit which did slow down the needle movement. (He is a mechanic by profession so he totally knows how to get things moving smoothly.)
We thought there might be another adjustment somewhere that would help. Like I said, it's no big deal, but if I had to wind many bobbins it would be annoying.