Does anybody know a geograft or morph for rounded arm stump? trying to use Amputee for G8 and G9 only gave me a flat cut instead of a rounded one. I have seen several on Pixiv or DA, but I failed to identify what asset they used for rounded arm stump.
Try turning limits off then turning the arm inside itself at the joint. Touch it up in PS if the texture looks off. I did this before on legs and got acceptable results
I did something like that once; I wanted to cut the arm above the elbow, so I selected all the children from the arm and reduced their scale to 0.01. My method is rather crude, I know, but I got the results I expected -although your standards may be higher than mine-