you have a metal plate at the front of the glass,when you open the door you will find a lever on the right hand side that pulls to the left(usually with a bit of yellow sleeving on it)then lift the bracket upwards,this will enable you to remove the glass retaining bracket(the reverse to put back on),then slide the glass out whilst supporting it by the sides otherwise it will shatter(there again you can slide it back just a little so you can drop the balls in at the top)and then happy gaming,t2 was the first pinball i ever worked on,oh happy days of youth when i had hair!!!!!