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The supports are not pressed on to the shaft. The shaft is kept from rotation by a pin in one of the supports. When the oil passage doesn't get enough oil to the rocker arms they can break that pin off and turn the shaft so it cuts off the oil from the rear support post that is drilled. On my MF-135, I made a new shaft and new bushings for the rocker arms. I used steel plugs for the end and e-rings in place of the tiny cotter keys. I changed the antirotation pin from 3/32 to 3/16, so I had to widen the groove in the support post with the pin. In my new shaft I cut a groove around the shaft so that if the pin breaks there will still be oil getting to the rocker arms. I had to soak the oil passage a lot to get oil to flow. I soaked it with Kroil and then I put 100 psi air back down to blow the crud back out of the passage. Its too crooked to run a wire, I tried that. Value built (take off the e and take out the u and add a dash between the words to find them on line) sells a rebuilt rocker arm assembly. They show the same one fits Z-120, Z-129, and Z-134. I need more machine tools before I can put my new rocker arm shaft into production. It cost me too much to hire a machine shop to grind the outside to size. Making new rocker arm bushings wasn't easy either, but my MF-135 is still running fine. Gerald J.
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