I have a 70's Raleigh Lady's sports, which I've retrofitted with one of the Asian made repro chaincases from Yellow Jersey. Somehow either the chaincase or the "pieplate" that covers the chainring have gotten bent or torqued, and the chaincase no longer stays snapped in. I can press fit it using 6 or 7 clamps, but as soon as I remove a clamp it pops back out. I found a place where the pieplate rim was slightly bent, and bent it back, but it didn't help.
Any suggestions for getting it to stay in place?
I've thought about putting little springy metal V shaped shims in to increase the friction in the rim. I could "glue" it in, but that seems like a bad solution for the long term. I've also contemplated tiny magnets or very tiny sheet metal screws through the rim, but that would be really really fiddly.
I'd love to hear if anyone else has encountered this problem and has a solution