This is something to watch out for in the new Duo...

We have the same set-up with a similiar cockpit (Duo vs Nimbus).

Today started off with an incident on takeoff with the Nimbus bouncing along with about 320 lbs of water ballast when the control stick (which is usually fully  deflected to both sides at the beginning of the roll) jammed in the full right position. The right wing dropped and I was reaching for the tow release when I was able to overcome the jam and get control back.  What occurred was something I have never seen or heard of before: There are holes in the back of the PDA cradle (which has a rounded bottom edge) and during a bounce the cradle went down and the push to talk button on the top of the stick depressed and got stuck in the hole. Once the spring loaded button popped into the hole  it was stuck and it wasn't until I forced it back (dislodging the button from the stick) that I got control back.

 

These photos explain the problem.  Note the hole and the rounded edge of the back of the Cradle. 

 

  

The next photo shows how the button on the stick locked up into the hole:

 

 

Top view of the cradle & stick locked together:

 

 

I have never heard of this happening before -but I would recommend that users of this type of cradle (or any with holes in the back) fill in the holes with plastic resin or something.

Thanks to Paul Remede for the cut and paste from his excellent newsletter...