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and thank you. I’ll try the ‘cleaning’ route first and take it from there.
The tube in question is below and has some weird stuff going on (to my eye):
The lug has an off-centre bore and there’s also a barely-visible lip that drops a few mm from the top of tube, down, on the inside. These things, along with the anecdotal (Internet) evidence that the seatpost ‘fit’ was variable on these frames, led me to think I should just get the bloody thing reamed and live with the consequences!
Cheers, P.
vilms5000
You need to work out what size post should be in it and get one.
Reaming should (as I now understand it) be used to return the id of the seat tube to round after brazing/welding. Ie, to remove slight distortions, not to increase the id.
I'd be starting by having a look down inside the tube to judge the condition of the metal. If it seems like a 27.2 is close then it might be 27.2 just with some rust on the inside of the tube. You can make a good tool for cleaning up the inside with a mudguard stay or wire coat hanger and some emery/sand paper strip or wire wool or scotch pad.
https://www.youtube.com/watch?v=xRIFqasCOSg
If the top of the tube is in good nick then maybe find a shop with a set of gauges