Ah, steering rateswitches, how to make your own adjustable transmitter instead of spending a fortune on an old high end radio. Here's a full wiring diagram for an old school steering rateswitch.



Should be fairly self explanatory.

The rate pot is the one that should be sticking out of the handset and is the one you use when racing, the trim pot is built inside and once set must be left alone.
Once built with the steering centred turn the rate pot up and down and make sure neutral does not move. If it does adjust the trim pot until the servo does not move in neutral when you turn the rate pot up and down.

Full instructions to fit it.
The Rate Pot wants to be a potentiometer with a 1/4" shaft that can be screwed through the case so you can adjust it.
The trim pot can be any small potentiometer, I use a tiny pcb mounted one so it can be soldered directly to the centre leg of the rate pot to keep itm out of the way.

1. Remove back of transmitter and drill a suitable hole for the rate pot, making sure the back of the transmitter still fits okay and the pot doesn't hit anything. Attach the steering rate pot to the case.
2. Rewire the transmitter following the diagram above, the green lead in the diagram was the wire that comes from the PCB to the middle pin on the steering pot, move it to the rate pot and add all the other wires.

3. Set the steering trim to the centre, switch on the transmitter and the car. With the stick at centre, turn the Rate Pot fully clockwise and anti-clockwise. The steering should not move, if it does readjust the Trim Pot until no movement is seen.

4. With the Rate Pot fully anti-clockwise, full movement of the stick should produce little movement. With the Rate Pot turned fully clockwise full movement of the stick should produce maximum steering. If the reverse happens or you want it to work the other way swap wire on 1 & 2 on Rate Pot.

5. Tidy up all the wires in the transmitter ensuring none foul the stick mechanism and there are no possibility of short circuits.
Now replace back of transmitter and you are good to go.