Re: Help! Stem fitting into base issue
this is a good thing, it ensures an airtight seal.
take off the grommet and run it under some warm water. then make sure the inside part of the neck is wet as well. put the stem on top then twist it down until you get the stem in the base.
i've had 2 KM's with the same problem. but be careful, you don't wanna rip the grommet. and if it really doesn't want to fit, try using sandpaper.