Loosen the screw valve on the end of the pump hose (the part that connects to the tube valve) so that it's a little easier to put the thing on and off your tube valve. A little loosening goes a long way- easy does it. It should not be too tight when putting it on and off to pump your tire.
AVOID wiggling the thing as you take it on and off- a sure fire tube valve breaker.
Lisa
My mountain dulcimer network...FOTMD.com...and my mountain dulcimer blog
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Yeah, you're better off trying to just yank it off straight than wiggling. Just watch out for your spokes. With a sticky pump and bladed spokes, bad things can happen.