In our kitchen area we have a skylight, no idea of make, with a blackout screen and also a fly mesh. the fly mesh is on a spring-loaded roller. Now the spring loaded roller seems to be FUBARed. I can take it out and wind it up, but the end of it appears to move in/out which means after a few open/close cycles it pings out and undoes. I can modify/superglue some plastic which will prevent it from happening, but would be happy to just buy a replacement roller. Any ideas?!