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I finally got to replacing my HH on my 1970 M35A2C. All was going well until I noticed that the metal piece with the slot in it which is inside the rectangular port on the HH and engages the nub on the fuel shut off shaft, it moves up and down with resistance. On my old HH, it slips up and down easily. So I oiled it with some ATF and moved it up and down, which helped some. I installed the HH and when I inserted the fuel shut off shaft, the lever swings back and forth, but it is stiff and I have to help it return completely with or without the spring-assisted part attached to the lever. The U-shaped clamp on the shaft is less than finger tight, so that is not the issue. My new HH is a "Diesel Fuel Injection Parts" brand in a blue box with white writing. It was thoroughly wrapped in several layers of plastic and inside a plastic box with red caps on the injector line holes. When I bought it some 3+ years ago, it was advertised as NOS. There is no ID plate on it. The part number is HD90101A, name is "Head Rotor". So my question is, can I repair the stiff part such as taking apart the HH and polishing the shaft that the slotted part rides on? Or is this out of my league and I should just b uy another HH?
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