I’m a year and a half away from having to do this dreaded job for the first time, so I’m asking you guys that have been through it if you had to completely remove the expansion tank to replace the rubber pad under the tank? It’s the one item for which Rotax does not have a silicone replacement (for the iS at least), so if we’re following their guidelines, it will still be an every five year job. Anyway, does the tank have to be completely removed, and has anyone found a silicone replacement?