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The bolt head is like a square not shaped normallysee @Fless answer now. Can you get a socket on the bolt head?
you loosen the nut, not the boltThe bolt head is like a square not shaped normally
This close up photo shows why socket doesn't work. there is no space for socket to slide on. The nut is pressed right onto terminal/bracketThe post clamp bolt? You could double-nut the threaded end and screw it out that way.
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I'm a little late on this but I would have told you to just bend the bracket out a bit. You still may want to do that.I got negative removed! Let pb blaster sit all day. Came back to it with pliers and was able to twist it back and forth to get it loose.
I don’t get why it has to be designed like that when primary battery was way easier