Cheap track pump / Presta question...
When I switched over to road bikes, I decided it was about time I replaced my budget Halfords footpump with something slightly better. I ended up getting a "Beto Track Pump" from Amazon (£20 or so) which is generally very well reviewed.
The connection onto the valve is a rubber compression locking mechanism, so flipping the leaver applies pressure around the valve locking it in place. So far so good, it generally works as intended - however, I have a devil of a time getting the damn thing off the valve once I'm done inflating my tyres. It often requires upwards of 30 seconds of vigorous wiggling and a surprising amount of force to get it off (loosing some air pressure in the process from the sounds of it). Is this normal, or would a better (read more expensive) track pump perform better in this regard? I find myself inflating my tyres less often then I probably would just from fear of snapping the thing.
The tubes on my bike have one of those little metal screw caps that you must loosen first which I suspect is what's getting caught, do all Presta valves have these (Wikipedia implies it, but I can't recall seeing them on the spare tubes I've bought but haven't yet had occasion to use)?