The college team I help coach has twenty six AP20's that we use for all the beginners. The universal grips work well for a remarkably wide range of shooters, but I've designed & 3D printed "booster" heel rests for students with small hands. They have material added above the height of the factory heel rest. For the students with very small hands that need a lot of "boost", the thicker ones are also shortened in the back so they don't dig into their wrists.
I have designs for +5 mm, +10 mm, and +15 mm rests. They are specifically right or left handed. I finally got around to organizing the 3D print files, and I have posted the complete collection to Thingiverse:
https://www.thingiverse.com/thing:6877717
"Booster" Heel Rests for Hammerli AP20 Air Pistol Grips
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