Sorry, wasn't clear that the handle was what I was talking about coming off with the small hex screw, it's probably hidden on the back side of the handle. Any of the online parts stores should have them too, I would think.
Also, check if there is a plug in the top of the handle over top of the stem. If there is, it should pop off and there is a screw under there that holds the handle to the stem.
2004 Dodge Ram 2500 Club Cab 4x4 CTD
2007 Sunline Solaris T-276-SR: Misty Blue/Cherry
2001 Dodge Ram 1500 Reg Cab 4x4 OFF-ROAD