Steve,
Depends on the problem. If you have an early frame (before 195k) than maybe you have a need for a conversion IF it is always hard to open, meaning it takes more force than you'd like. The conversion gives you more mechanical advantage and makes it take less pressure to open the frame. If you have a frame that sticks after you fire a round, you've got a whole 'nother problem. Lots of threads on here about it, try "contender won't fire" and "Breaking open Contender" I think they're the most recent. Again it depends on when you're having trouble opening it.
helicopter Bill