@crm2090
Did you try leaving it under tension? Then heating the swing arm ‘knuckles’ either side? The chances are it’s going to be the bushes inside seized to the bolt. Either that or the bolt ballon’s with rust in the centre were it passes through the engine, thought that would allow some small movement…
Hotshot is spot on. A good solid frame is unicorn shit nowadays. You can get cases (with numbers 😜) and swingarms all the time…