I purchased the Jamieson coring system some years ago, including 2 cutters and the sharpening jigs. I cored with it a number of times, but went on to other things. I took it out to use it again recently and decided I needed to sharpen the cutters. Unfortunately I found that the screws holding the cutters are totally stripped. I can't get them out. I used a flat diamond bar to hand sharpen, but I would really like to be able to get those cutters out and properly sharpen (I had an agonizingly difficult time coring a heavy and dry block of oak - could've been partly due to the wood itself, but I think a sharper cutter would have certainly helped).
Any suggestions on how to get the cutters out without ruining the thread in the arm? TIA for any advice.
Oneway cutter screws.jpg
David