I claim patent right on all of these. I have made my own headset cup remover by cutting a piece of copper pipe/tubing with a hacksaw in an X pattern down about 3 inches. Spread the legs a bit and it works well and is soft copper.
Used an old, cheap, bike trainer as a truing stand for years till I got my old Schwinn/Parks version.
My favorite is using a drill, a nail and two claw hammers to form my own, guaranteed to work, seat post or stem remover. A bit hard on the seat post or stem but they all come out. I have even experimented with wire and a dent puller to extract stubborn seat posts and stems and it works fairly well and is less destructive.
Ray Homiski
Elizabeth, NJ