Quoted from MrArt2u:Yup, GTB glass is a pain to remove. Muscle it, buddy. Channel all your inner strength because you know how much breaking that glass would hurt you inside. It's like the story of the mother that lifted a car off her baby or something. Use your love of the surfer girl on the backglass to give you the strength.
I'm curious, you mentioned the four pieces, do you remove the playfield to move cabinets?
yea, just heave that bad boy off of there... i am far from the strongest person in the world, and i can muscle a 4-player head off (albeit with a lot of effort)...
as far as removing pf's... i dunno about the op, but the couple times that my wife has been the "helper" to move a machine, i not only removed the pf, but the mech board as well... it only takes a few minutes, and it makes it MUCH easier for the 2 of us to handle that way... i also moved one alone this way, but it sure helps to have that extra pair of hands to pick up the cab... i can lift it no problem, but it's so big that it's a struggle to get it anywhere...