Dear D Winn,
I have a "49" 3100 with the same brake return spring problem you encountered a few years ago. The replacement springs from two aftermarket suppliers are too short by about (5) rings i.e. (30) rings on the new springs and (35) rings on the old (see photo at link below). Was NAPA able to solve your problem and if so, do you have a NAPA part number?
[url=https://goo.gl/photos/dgBriike2Gr85SZ78][/url]
Best Regards,
Mike Harris
