[desotoguy]

Having a freshly painted ws frame, and needing to install the glass without damaging the paint, I came up with this solution.
Two pieces of 2x4"x 24", slot 1" deep x 1/4" + setting tape thickness wide in the center of each.
Stretched the set tape completely around the glass, joint at the center top.
Set the glass in the slots, top down.
Water with dish soap of the tape.
Lower 3 sided frame down onto glass, push until completely set. I was able to set without excessive force, ie hammer.
Turn frame with glass right side up and install the top metal and screws.
Trim away excess set tape.
This worked for me, no paint chips or marring.