assuming it is a Simmons, there are repair kits, I rebuilt the one at
my carport this year. I went for just the plunger (N on the diagram).
the whole repair kit isn't much less than a new one, but at least you
might be able to fix it from the top. i couldn't and ended up digging
it up, unscrewing it and rebuilding on the tailgate of the truck.
http://www.simmonsmfg.com/online_cat...antparts4.html