Sorry if this is not the right forum, but it seems to get the most traction. Feel free to move if appropriate.
Just bought a PKZ Extra 300 BNF and disappointed with the engineering/build quality of the plane. The area of concern is the Horizontal Stabilizer-Elevator assemble attachment to the fuselage with Scotch Tape.
At first I thought is was flaky but went with it. After I got the plane assembled in 5 minutes it was time to get the control surface aligned up straight. Ailerons and Rudder no problem.
Elevator would not line up. Always down. Reached the end of the push rod threads still down. Then I noticed the scotch tape let loose. and the HZSE assembly was sliding around because it was not secured. Drats
Anyway I came up with three work arounds and scratched my head a couple of days being an engineer.
1. Secure with CA. Nope want portability. Being portable was my main objective buying the plane.
2. Drill plastic collar that the HZSE rest in with 4 holes 2 on each side and pin it with toothpicks. Threw that idea out because th efoam is not strong enough and would wear out where pins pass through.
3. Then it hit me as I was thinking and the control arm clevises caught my eye and sparked the solution. Same as idea #2 except use the same type screws used on the control arms. Exact same principle of using the plastic collar to sandwich the foam, and the screws to clamp down tight.
Works great and thought I would share. Had to do one more mod to lighten the plane up and correct CG.