Having replaced the front subframe mounts, I want to do all i can to prevent them rotting, and considered filling the 'void' as the main issue appears to be water etc. sitting inside the mount. What have others done / is there a recognised way to do this? I'd rather not just fill them with foam or gunge, and would like to find a 'cap' that will fit.
I've considered going round the supermarket with a mount, seeing if i can find an aerosol lid that will fit snugly inside the mount, but i'd probably get arrested
Any suggestions?