I would just buy a new switch anyway. After 50 years the original switch plastic has seen a lot of cycles and its just a matter of time before it fails.
There are two basic type of switches for the 68. Boyne and Delco. One way to tell the difference without pulling the wheel is from the hazard pull switch base. Boyne switches have a round base, Delco a D or doghouse shape. They are not interchangeable.
Some of the new Delco switches require an adapter to work with the original 9 pin connector.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
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