When you want to take that pressure foot thing apart oil it with Tri-flow - wait - then use a little heat to turn it. BUT be very careful of that presser foot spring - that sucker will fly out of there clean into the ceiling as hopefully it bypasses your eyes (HINT: it was called a
pressure foot by my mom for years...) There might be some kind of a set screw somewhere.
I wish someone made a HC that attached to the box or table or the little hole in the back of the machine where the round hole cover goes or something. I have a mess of machines that could use something, too. Not enough treadle irons to go around - too many people use them to make tables or what ever they do with old treadles. There is someone out there making 2 or 3 dollar window cranks into hand cranks and selling them for $40. You might be happy with one of them on there. Better still figure out how they did it:
http://www.ebay.com/itm/FEATHERWEIGH...item2574d9564e