[mikethedruid]

Go to a auto parts store and see if they have rubber grommets. Most do. Buy a grommet that fits inside the bulb holder socket. run the wire through the hole in the grommet, and presto, you have a bulb holder with new rubber. I have done this and it works. You may need to shave the grommet down a bit for the bulb to push in easily, but don't take off too much. It needs to have some spring to it to make good contact with the center contact of the bulb.