The slide on our Greyhawk was not square with the wall. When retracted so that the front vertical gasket was compressed, the rear gasket was barely touching. It leaked a couple of tablespoons of water in the first driving rain we encountered.
Our dealer adjusted it so all gaskets are compressed evenly. No more leaks and we've had several hard rains this year. It glides in and out more smoothly, too.
2014 Greyhawk 31FK
2007 Honda Shadow Sabre 1100cc