I have a house built in the 1980's. The tubs have fixtures I've never seen before. One needs to be repaired or replaced, but not sure what to replace with or where to find parts for repair. This photo shows fixture with knob off. Note that there should be small diameter shaft threaded on inside and outside. It's broken off in the photo. The broken off part turns water off and on. The plastic part seen in photo adjusts temp.
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