The amount of times I've looked at them keys Ideally get one of these - A bleed key - you'll get them most places, SF/TS/B&Q/Etc or Amazon
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Try not to use a screwdriver, they're not the best tool to use and can snap a tight bleed screw
Bleeding the rad should have nothing to do with the bottom connector, apart from the fact that there's pressurised water in there. The coupler is leaking because something isn't quite right and it'll either need tightened up or replaced.
2 different kinds probably due to the fact that one of the originals needed replaced.
I wasn't sure how much to bleed the radiator it comes out a little hole near the top but the water seems clear
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