I picked up a seemingly decent Trek floor pump at a thrift store for a couple bucks. The pump head is one that "locks" onto the valve (in my case presta) by flipping the lever on the back of the pump head. When I get up to around 100psi while inflating tires, the pump head just pops off the tire valve. I'm assuming it simply cant hold onto the valve tight enough. Can I replace the pump head? Silca heads seem easy to come by and I thought about putting one on there, but wasnt sure if it would fit or work.
Also, I've never had this problem when I use a silca pump and they have no locking levers or anything. How do silca heads stay on the tire valve at high pressures? Thanks!