Originally Posted by
rekmeyata
I don't have replaceable valve stems so I can't comment on that. But if that is the case and someone uses replaceable core then obviously that should be considered and the Topeak would be the better pump since it doesn't screw onto the stem. If you had that issue maybe Lezyne should be told about it and see what they say.
The Lezyne manual recommends using Loctite to install the cores.
I don't, but I do make sure the cores are tight, do not over-tighten the Lezyne chuck and make sure I am not twisting at an angle when I loosen it. I did loosen a core once, but it was one of the first times I used a Lezyne on a removeable core.