I know its eight days later, and you may already have them out, but here is my tips, maybe someone can use this info in the future.
When you get those adjusting screws/bolts out, don't use them again. Replace them with SS Hex headed bolts, and when you reinstall the new ones, use some anti- sieze on the threads. They will be a lot easier to loosen if you have to, in the future, with a box end wrench, than using the original flat bladed screw type.
PB Blaster has worked well for me in the past as a penetrating oil to loosen frozen bolts, it works better if you put it on, then let it sit a bit, before attempting to break it loose.
Taking that crossbar off, wrapping it in a small rag, putting a piece of wood under it, between the slide bar on the vise and bar, then clamping it down just enough so it won't move, will make it easier to work with. Just do not tighten the vise to much or you will risk crushing the bar on to the adjuster fitting. If you have one, an impact driver is a good tool to use on this,or a stout screw driver with a hammer ( turn as you smack the end of the screw driver, make sure the wood spacer underneath supports the bar, while it is tightened down in the vise, so that when you smack it, it does not push down and is supported underneath where you are hitting it) as M.M. said "vise grips" works good too. but they are going to have to be real tight, on the flat headed bolt to get a good bite. If at all possible, someone help you. if they are frozen on there that bad. In my case, I just got mean with them, one, I snapped the head off, the other came out, but had to work it. ( I may have used a propane torch to heat them up a bit, but did not get them to hot, out of fear of melting/ deforming the aluminuim)
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