best to check all valve inserts are tight on all tubes when you buy them. If you carry a small adjustable spanner it is exactly the sort of thing that can be used to retighten valve inserts.
But this is the best idea IMHO;
gilesjuk wrote:Just use a pump which pushes onto the valve and then locks in place? (with a lever).
pumps that screw onto presta valves are (by and large) just stupid. My vote for 'best pump ever' goes to the zefal HPX
or classic silver
also (since 2010, but not widely) available in a 'light' version (84g) which is a mini-pump with the same workings as the larger pumps (but shorter obviously)
IIRC the HPX 1 is only 35cm long when compressed and (perhaps when strapped to be as short as possible) should fit easily into a saddlebag or pannier, so it is practically a mini-pump anyway. Does schrader or presta, and even makes a half-reasonable fist of doing woods valves too.
BTW the HPX design is now over 30 years old and there have been only very minor changes in that time; if it ain't broke, don't fix it....