F4 BLT stuck/rounded bolt removal

If you go down the slot cutting route, my advice would be not to use a screwdriver, but instead something with a long flat edge. This way, you can fit it fully into the slot and more, avoiding the screwdriver chewing the slot up. You are also using leverage from the side rather than a twisting force which in my experience reduces the risk of ripping the top off the Allen bolts.
 
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