Believe I got it fix.
Made the adjustment holes that are slotted a little longer by elongating them at the top. This is where the "elbow" of the riser app rotates on a three-point mount.
I enlarged the holes for the crank app and raised it slightly.
When placing the window (framed) on its mounting track I pried it up while tightening the screws giving me a little more lift.
But there is little one can do for the wear and tear of a 70-year-old mechanism, but I did peen the rivets on the joints tightening them a little.

Hopes this helps someone.
Thanks


1950 Chevy 3100 PU all stock