Ok, you'll need a small cross-head screwdriver, a fine-tipped soldering-iron, solder, de-solder braid (or a de-solder pump if you prefer to use one of those), and two 1k0 1/8W (or 1/4W) resistors.
To perform the modification, do the following in this order:
1/ Remove the batteries and open the transmitter case, being careful not to lose the plastic parts and screws, etc. Remove the circuit-board from the plastic shell.
2/ Identify the 'yaw' potentiometer (it's the rectangular green plastic part that is positioned at the front of the LH joystick assembly). This needs to be briefly removed, but luckily this can be done without de-soldering the whole joystick assembly.
3/ Use the de-solder braid (or pump) to de-solder the three yaw pot pins from the circuit board (make sure they are completely free of solder, and able to be moved about in their holes).
4/ The yaw pot is held to the metal joystick assembly by two plastic tabs. Remove the pot by squeezing it at its sides (I used my fingernails) to dis-engage the tabs and tilt it forward. It should now be possible to completely remove the pot from the circuit board.
5/ Bend the two outer pot pins so that they will stick out parallel to the circuit board (instead of passing through their circuit board holes) when the pot is re-fitted. Don't bend the middle (wiper) pin - it will be put back into the hole it came from.
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