Unfortunately, there are not a lot of tricks out there. The one that comes to mind on a hard to access bolt is to just grip it with vice grips and use them to turn it and remove it.
This is going to destroy the head of the bolt, but it needs to be replaced anyway.
After this, the only solution is going to be to cut the head off and then extract the bolt threads or drill it completely out.
Clearly if you don't have access then this is not the best solution.
Lastly, you will have to remove everything that is in your way so that you have access to it. Not the most desirable thing to do as it makes the job longer but if you can't get it out then you have no other options.
If you get some pictures of what you are dealing with then I may have some other ideas.
Thanks
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Wednesday, June 22nd, 2022 AT 9:30 AM