Have a look on Youtube for videos using solder ring/Yorks. fittings. No need to feed solder in, it's there already. Just clean the end of pipe, make sure no water inside pipe, even smear of flux and apply heat until you see the silver 'ring of confidence' appear around the end of the fitting. Dead easy. Us plumbers prefer to use end-feed because we like to make life difficult for ourselves. And some are cheapskates. Advantage with end-feed is they look better, but take a bit of practice.
Cheap benders sometimes do this. Not detrimental to the strength of the pipe I wouldn't have thought. But it looks fooking awful. Buy a better bender of you'll just have to live with the ripples
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