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@zootsuit
Thanks Scilly, the bike looks to be at least mid 70's , although the wheels are alloy replacements I suspect the QRs are also at least 20 years old. I've bought a new front and back QR to be sure.
I just wanted to make sure it wasn't the chain jumping up the freewheel, I don't want it to happen again! I'll properly calculate the chainline this time and use some spacers on the chainring to be as close as possible.
I might try roughening the dropouts as well, they are the stamped smooth variety.