Originally Posted by
Kimmo
I have a setup I prefer - my pump has a brass Shrader head on it for some reason, so I use a brass adapter that has an o-ring that seals nicely on the valve when it's screwed on. This stays screwed into the pump head, which has a rubber washer the adapter beds into. You have to unscrew the valve a bit hard so it doesn't get tightened up when you screw the pump head on, but the Presta threads are nice and quick, so it's not much of an extra hassle.
I don't mind the little bit of extra effort required, cause I'm assured no leaks or valve damage.
Cool! For the purposes of whoever use search to find a solution to a similar problem, here goes.
I just flip my Lezyne chuck to Schrader, screw on a Schrader adapter to my removable valve core and pump away. No issues. And cheap too, as the adapter is only $1.