OK, so I just installed a stern direct factory shaker in Iron Maiden: Legacy of the Beast (Pro) , and the default was way too strong. I rotated to 180° and its much better now.
However...I had a hard time loosening the bolts with an allen wrench. I actually stripped 3 allen wrenches trying to loosen them up. I was worried I was going to start stripping the shaker screws and never be able to tame it down.
I then tried a torx screwdriver bit that fit and it came loose right away!