06-15-2011, 11:53 PM
I took and sanded the outside corners on the tube and that helps it to fit. But don't sand any further up than the very lip. It also helps if you warm it a bit in your hand and squish it a little to get it flexed up and ready to push in. It is a tight fit, but it needs to be so that it doesn't pop out each time you pump.
[signature]
[signature]