[john charlton]

Could be the switch is slightly misaligned not allowing the spider to go fully home . Get an able assistant to gently move the lever at the steering wheel to and fro while you try to push the switch body in . Daughters are best for this kind of thing as sons are generally smarter than Dad and might have a better idea. But you could try the wife but they are not always available (cooking,housework etc etc)

John in very hot humid Suffolk County England .