This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
If the trigger on your "Flight Stick" doesn't always fire when squeezed, the problem is likely to be too much space between the trigger and the PB0 microswitch. A simple fix is to apply two or three layers of self-stick label bits to the back of the trigger piece (easily accessed once the handle is opened). To check your work, use an ohmmeter connected across the button output or plug in the stick and RUN a two-liner to display PB0 status: 10 IF PEEK(49249)>127 THEN PRINT "X"; 20 GOTO 10 Pressing the trigger should spit out X's. Once you know your stick is fixed, just slap it together and you've got the hair-trigger snap-action response "Flight Stick" is supposed to deliver. By: Mitchell Spector