Thanks. I tried that but they’re not going to push in without a fight. The gasket is 6mm thick and not very compressible. Concerned I am going to damage them as it will need a screwdriver or similar to force them in. Unless there are any other suggestions on here I might try taping them to the bead to hold them in place while I fit them and then removing the tape. Job for tomorrow, not today though with the weather.