boltsremovalscrewsstuck
Some time ago I had a handyman install a pull-up bar with some "M10 x 75" bolt screws that came included with the pull-up bar.
When I try to take the bolt screw off to remove the pull-up bar, the bolt screw just spins. If I try tightening it, it also just spins.
I have tried using vise-grip pliers to pull the bolt screw away from the wall while I turn the bolt screw counterclockwise, but I have made no progress here. Any advice would be welcome.
After cutting the bolt to length, use a stationary grinder instead of a file to clean up your work. With a grinder, it's easy to square up the end of the bolt and apply the chamfer that you want.
Just be careful, especially if the bolt is shorter than the grinder's table. If the bolt is short, use a pair of vice grips to hold the bolt during grinding. And remember that the end of the bolt is going to be very hot after grinding!
It looks like a lockring is used to hold the screw in place. You'll have to hold the screw still and rotate the lockring, or vise versa.
Using a flat-head screw driver and mallet, is a common way to rotate lockrings. Though, you'll have to find a way to hold the screw steady, while you bang the lockring free.
It's possible that the lockring is made of some type of softer metal, so grabbing it with pliers could easily damage it. Using a screwdriver and mallet applies force only in a useful direction, whereas pliers apply non-useful forces required for gripping. These non-useful forces may damage the lockring.
Best Answer
I have had success using a jemmy bar (or crow bar) to "load" the bolt while turning it with a spanner or socket, this gives much more pull than just pulling with pliers.