I feel stupid but I just got a 550B and I'm wondering if anyone else has had primers stuck in the pick up tubes?  I'm using the large pu tube (green end) for large pistol primers.  Sometimes I can pick up many and the next time I pick up maybe 5 and then they wont slide.  Also, both of my pick up tubes have primers stuck in them now and I don't know how to clear them.  What gives?

Tom