Maybe I am doing something wrong, but I have tried and tried to get 1/8" plexiglass to work on the inside pane of these machines, my problem is the plexi flexes just enough to get a ball stuck between the plexi and the nails. I know others here have had success, but me, not so much, any help would be appreciated. I know others prefer glass on the inside, but I need to turn down the noise just a little.