You will need:
- Place you can have good airflow to use very fumy glue
- Place you can let the project cure for a few days of emitting those fumes
- Some stuff to clamp the pads together for a couple days (I use scrap boards and bar clamps)
Get this: https://www.amazon.com/Mechanical-Keyboards-MacBooks-Notebooks-Neoprene/dp/B004DANDN4/
Get one of these:
- Brown: https://www.amazon.com/Grifiti-Leather-Wireless-Keyboards-leather/dp/B017I3MZKO
- Black: https://www.amazon.com/Grifiti-Leather-Wireless-Keyboard-Keyboards/dp/B017I3HYDC
Note: I've only ever used brown, black leather dyes can rub off on wrist, ymmv.
Get some of this: https://www.amazon.com/Barge-Toluene-Free-Purpose-Cement/dp/B002JL2ZGA/
Peel the nylon top off of the FAT neoprene rest. (Use this TOP side as the new BOTTOM, it is stickier to your desk).
Put Barge Cement on the slick size of the FAT wrest, and the rough side of the leather.
Cover generously, it will soak into the leather.
DO NOT PUT TOGETHER: Let the Barge Cement cure for 10-15min until tacky.
Put peices together. Clamp together with whatever is handy (I use some scrap boards and bar clamps).
Let cure for 48hrs. The cement will stink for at least this long.