Trying to remove the sight glass from a Tokheim 39. I've got the outside ring with 8 screws and gasket removed. However, the glass itself seems "glued" to the assembly. I've scraped out all the material between the edge of the glass and the recess that the glass sits in. Tried to pry out the glass with no movement. Is there a solvent that will work it's way underneath the back side of the glass to loosen it?
I'd like to reuse this sight glass but it looks like I might have to break it out to remove it. Trying to get it out to clean the brown gas crust lining the inside. Thanks Bob