I recently destroyed 3 tubes using a hoseless pump on presta valves. (My Roadmorp was out of service.) Due to brake clearance problems, I have to pump up the tires after they are on the bike.
What's the secret to using a hoseless pump on presta valves without breaking the valve stem? I did my best to stablize it while pumping, locking my fingers around the spokes, but the back and forth was still too much for the stem.