I found another problem with the Extra yesterday: the stab tube did not align perfectly wit the wing tube (left lower than the right). See picture 1.


I ended up removing the stab tube socket, rolled a new fiber-glass one with 2oz cloth. See picture 2.


Then I adjusted the mounting hole on the left fuze, and installed the new socket. The stab tube is perfectly aligned now. See picture 3.


Will try more up-thrust idea and report back.

BTW, the alum stab stub is 1.4 oz in weight. If replaced with a lighter carbon fiber one, some nose weight (if any) can be removed.