I had one on one window. When I looked at it, it reminded me of something I'd seen somewhere before. So at the hardware store I bought a nylon roller about 1" round, with a small ball bearing centre in it, theyr'e used around the home, riding the track rail on the bottom of sliding fly screen doors and mesh sliding security doors.
It worked.
"After you skin yer knuckles, Mr Shifter ain't yer friend any more."
1942 Chevy 3/4 tonIn the Stovebolt GalleryPhoto Site1946 Chevy 5 window coupe/ute (new stray)
2000 Nissan Patrol 4x4 4.5l turbo diesel