Both this Sunday and last Sunday, I've had the hub on the syringe
that the needle screws into, come off the shaft.  Last Sunday, I
didn't see the problem until the Enbrel leaked out when I started
the shot.  Today, I saw the problem happen.  When I screwed the needle
into the hub, the hub pulled up on the little shaft away from main
barrel.  In both cases, I removed the needle and pushed down on
the hub until I heard a click.  Then you could screw the needle in
as tight as you want without the hub coming off.

Apparently, I've had hubs that weren't pushed all the way on at
the factory, from two different lots.  Has anybody else had this
problem?

Ray