This wasn’t specifically knocking in a bat, this was just access to a machine at work whenever I fancied
I have had a few GM bats in the past and to be completely honest, they take a while to get going. More than most people have the patience to wait. I think its more to do with how stiff the handle is than the pressing itself. Someone like me who used to bat in the nets once a week for approximately 10-15 mins, it took about 7-8 months before i was confident i could use it in a game. My teammate wasnt as patient with his Neon Original. He had the handle modified with an extra rubber insert which apparently accelerated the process for him. He loves his GM now and wouldn't part with it
https://www.youtube.com/watch?v=Rk07_tuSHkM
Stiffer handles means more power through the shot. I would use the bat first before you start jumping on the handle.
This is a brilliant way to kill your bat handle. Just don't.