Before you ask, YES, I switched the head around inside so it fits Presta.
My problem is, I unscrew the little lock cap on the end of the presta all the way, but the pump won't go all the way on, it depresses the plunger before I am able to lock the head on, so all the air ( and sealant on my face ) comes out.
It's a Mammoth Frame pump.
It's almost like the head needs to be longer so more of the valve can go into the pump before locking on.
Anyone else have this problem?
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