Originally Posted by
HillRider
When you push the pump head onto and take it off of the valve, be sure to do it in a straight line. If you insert or remove it at an angle you can bend the valve's threaded core.
Sounds plausible. Thanks! I'll try to trace how exactly I push the pump head.
Originally Posted by
fietsbob
A sharp edge in the hole in the rim?
I Can't judge your technique from here. maybe ream the rim out for the auto valve type stem . and use a thumb lock head, on a hose and a floor pump
so you dont move the stem as you pump, or install or remove the Pump head.
Mavic 4 CD.
Thumb lock will surely adress the issue, they just so easier to use than pumps with integrated head.