Original Lifting Grips The Alternative to Gym Workout Gloves Comfortable & Light Weight Grip Pad for Men & Women That Want to Eliminate Sweaty Hands Gym Gloves

Two things: a rotary tool with a sanding drum. I think < $10 at Harbor Freight. hand pads. I bought some long ago. They aren't rubber, but feel rubbery and are made for weight lifting. Keeps my hands pliable all the time, and improves the grip. Like these: https://www.amazon.com/Soft-GRIP-POWER-PADS-ALTERNATIVE/dp/B00720C42I