Wednesday after I got to work I did my usual once over and when I squeezed the rear tire it felt kinda low, naturally I pumped it back to pressure and at my break I checked it again,drat it was low so at lunch time I put in a new tube. That tube also did a slow realease of pressure so I figured if I pumped it up just befoer I left work I would make it home ok and I did. I used my Topeak road morph and had never had any trouble with this pump but this time I ended up bending the brass core on both the first and second tube. These tubes had the 48mm long stems and I think that was part of the problem, (ie) not getting the head of the pump in straight. I don't seem to have that problem with the shorter stem Presta valves. I'm also thinking maybe the plastic innards of the pumphead on the Topeak are partly to blame. I may be all wrong but I just wondered if anyone else has had this problem. I don't have a problem with my floor pump at all. Is there a good pump out there that has at least some metal parts in the pumphead?