Boalsburg, PA
I too had a mushroomed magnet core on my Spiderman and didn’t want to pull the core down through the playfield. I couldn’t keep the core from turning with a large screwdriver and didn’t want to damage the playfield. Problem was solved by drilling a hole through another nut and feeding a #6 nail through the nut and slot in the bottom of the core. See picture. This allowed me to use a large wrench to keep the core from turning while I loosened the original nut on the magnet core. Hope this helps some with a similar issue.
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