There is supposed to be "glass setting tape" to install the vent glass into the pivot.....
Different thicknesses are available, you would need to determine what thickness you need.
GZ-R031 Various Yrs Sealstrip All Rubber Glass Setting Tape - 1-1/2" width x 1/32" thick $ 1.85 ft.
GZ-R047 Various Yrs Sealstrip All Rubber Glass Setting Tape - 1-1/2" width x 3/64" thick $ .85 ft.
GZ-R062 Various Yrs Sealstrip All Rubber Glass Setting Tape - 1-1/2" width x 1/16" thick $ 1 .90 ft.
GZ-R093 Various Yrs Sealstrip All Rubber Glass Setting Tape - 1-1/2" width x 3/32" thick $ .90 ft.