Well I was curious about the device and being cheap made one for 10$. this got me grommets and a setting tool at wally world, the rest was homemade engineering. Well I've noticed me colapsing occasionally at release. before when i would release I'd give a little bump back hand still touching my face. When I tried the formaster on the first shot I nearly colapsed completely with it pulling my bow arm forward. eventually I came around and started pulling through the shot, giving a solid holding finish. When the formaster was removed and I shot my hand flew off my head and was over my shoulder 6" away from my face. To quote steve carrell in Despicable Me, "llliiiigghhhtttbbbuuullbbb!"
I am going to keep working at this and report back.