While the Silca pump I just got looks nice, and appears to be well made, I have never, in my 25 year "cycling carrier" have had so much freaking trouble trying to put air in my tires!!! (Well, except for that time many years ago when I tried another Silca pump.) There've been times it literally took me 5 MINUTES to get a tire to the proper pressure. Either the chuck blows off right after putting it on -- or just after I begin to pump it -- or nearly all the air comes out of the tire before I finally manage to get it to stay on. I seem to have a bit less trouble if I twist/screw the chuck on, though the instructions say to put it straight on (for a presta valve). Is there some special secret trick to getting this thing to work? Or is this just something that takes time to get the hang of?