Here is a simple device you can build to remove stud type earrings that have become difficult to remove. I invented this device out of necessity when both my daughters had their ears pierced and a slight infection in the earlobe warranted temporarily removing of the earrings to help cope with the pain. It is simple to make and is most effective. You will need a bolt, a wing nut, and 2 staples or something equivalent to be used as hooks. Note: I used 2 staples as it was readily available and if used with caution, should not pose a risk.
Step 1: Build
Simply drill a small hole at each wing end of the wing nut large enough to accomodate a small hook. I used 2 staples for my hooks.
Slip the hooks in to the wing nut and screw the wing nut into the machine bolt. Make a dent at the end of the bolt in the middle.
I drilled my dent though you tapping a nail into it should work.