I maybe wrong but....
didn't Maytag go from using the mercury lid switch to the mechanical combination lid/off balance switch with the switch over to the helical drive models in 1956/1957 or did they still use the mercury switch in the early helical drive models that had the tub light built into the edge of the lid.? IIRC they used the AMP style lid on the models with the light in the lid didn't they?PAT COFFEY