Update: I installed a different cocker valve, and the new one doesn't leak. (YAY!)
Here is the weird thing though: The marker still re-cocks itself. Shouldn't a cocker valve, since it doesn't have the little vent like the Raptor valve has, not be able to blow the hammer back into the cocked position?
My friend who has previously done two Raptor pump-conversions said all he did was block the vent hole and that stopped it from re-cocking. Why when I install a Cocker valve that has no vent hole would the system still reset? Should I remove the hammer o-ring?