While cleaning one lens of my 80mm, f5 (400mm focal length) finder/guide scope drooped and cracked
If you have an old scope like that (Orion 80 Short Tube, Skywatcher TravelStar 80, Synta ST80, ...) and the lenses of the doublet are fine, I am happy to buy the lens cell (lenses included) or the entire scope itself.
Thanks for reading.