Sew Classic might have a new
friction wheel for the motor, for hard to find parts I have often been lucky on ebay. There are a few people you can contact like Cindy Peters; she has a facebook page called Stitches in Time. With a bit of patience other's here might identify the correct type bobbin and bobbin case. As a temporary solution some have managed to sand down the rubber to even out bumps and wear. To get better grip some have even used a resin cube for a violin bow with success.