I just recieved my Super Joysticks from Happ and am not sure about a part that was sent. When I went to install the joysticks I used the plastic collars that came with the joystick (one is for wood and one is for metal), and both of the collars did not set flat with the CP. I'm using 1/2" MDF and 1/4" plexiglass for my CP. I have thought about just cutting these peices shorter, but wanted some advice from those who have done this before first.