When taking th elower hose of my radiator (brass) I managed to bend the "nipple" so now it leaks with the new hose on it. I use channel locks to break loose the hose. So its oblong, I tried to get it orund by squeezing the opposite high spots and that made it square. Any suggestions on how to make it round again? Preferable with the hose still on so I dont have to drain the coolant again.