Very effective and economic way of resurrecting an old nylonglyde rail where the bracket had failed.
Bayliss Auto Greenhouse Window Roof Vent Opener Solar Powered Automatic Easy Fit
20 Jun, 2020
Fitted to Rion Greenhouse
Obviously not designed for Rion plastic frame greenhouse so don't buy unless prepared to improvise fixing. Involved some drilling, filing and larger bolts and washers. Worked fine for me.