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@adroit
Don't heat it, you will destroy more than the paint (the epoxy in the tubes for example)
Somehow you need to apply some pressure to the frame to get the tube to move away from the lug
You can apply a lot of force to the tubes if you are bending them, so the ratchet strap method will pull the tubes apart, and expose some of the lug so you can get some epoxy in there.
The way to do it is to get two straps and two fixed posts the right distance apart that the straps can loop around and around the right part of the frame. Tightening the straps will try to pull the frame apart.
I wouldn't try to shock the epoxy you recently applied, the bond will be too strong, and the glue won't be brittle. It won't crack!
I would happily give this a go if you can get it to Reading!