My 320 developed an uncivilized behavior pattern early on.  When I
thought it ought to start to float in ground effect, it would just quit
flying 2-3 feet off of the ground.  Turns out (this is anecdotal, at
best) that the tape I had used to close off the BL50 gaps on the wings
had, due to poor mechanical properties, shredded and - for all practical
purposes - disappeared.  My landings kept getting worse and worse.

Can't rule out the nut holding the stick, but once the  BL50 gaps were
re-sealed, the landings improved immeasurably.  

Dick Alden,   LNC320, N425A  (short dynafocal, O320, CG well forward)