Thanks so much for your diligence, abonano! I tried this technique, but still no success! When I push the mesh while lowering the screen, the mesh just gets all jumbled. The roller must be kaput or there are gremlins at work thwarting all efforts. Maybe said gremlins will release the roller! I am resigned to keeping it up, until I am no longer resigned to that!

Thank you all for your generous attention to my issue and practical, economical suggestions!