I have a 127 that was changed to electric in the late 40's- I have another that I think is also- then I have the one my husband bought in 77- the oldest machine is the best but I need a new spring on the front that adjust tension- it's so old it loosens up after sewing for a while- any suggestions on parts?- I have 2 portble Janomes but I like the old singers best- u can sew leather then lingery and it just keeps on sewing