If it is working OK, the basic maintenance procedure is this:
Clean lint and debris from bobbin and hook area.
SEWING MACHINE OIL in oil holes and lube points (see owner's manual.)
Grease (no oil!) where gears mesh. Vaseline can be used if you can't find sewing machine grease.
Decent car wax on painted parts. I use (orange bottle) Nu-Finish.
New rubber bobbin winder tire and broken spool pin can be purchased from Jenny at Sew-Classic blog (from earlier message.)
PROtip: If the stitch selection knobs resist going into some combinations, push on the needle bar towards the right lightly, and the knobs will move much easier. (BTW: You can also put TWO standard needles in the machine at the same time, rather than buy expensive twin needles.)
Enjoy. Don't be surprised if you start looking to buy another one soon.