THUNDERBIRD 1963 car indicators on 1963 Tbird different on one side to other, Where is the indicator switch?

I have a 1963 T Bird the indicator flashers work on the left (drivers side) but stay ON on the other side and dont flash. When the car is moving fast (high engine revs) the right side will (sometimes) click on/off once or twice maybee. The brake lights/bulbs are ok. all the lights work ok being an older US car the indicators at the back are the same bulb as the brake lights. Ive checked the earth at the light units and wriggled the arm on the indicator arm. Finally does anyone know HOW to get to the indicator switch its somewhere behind the 1963 horn ring, does this come off? HOW,? what do I do Im in the United Kingdom so no garages have much knowledge of these cars. Thanks Neil