Dukester,
The rubber seal and the switch are two different things. It sounds as if the rubber seal is at issue here and that the switch is working fine. Is that correct?
Yes. The rubber seal can be very easily removed and replaced with a new one. It is a little harder to remove and replace than a MagLite rubber seal, but it's still the same exact principle.
Call TigerLight. They'll probably just send you a new rubber cover free of charge.