I centered mine before I put the pump together by bending the trunnion arm under the press. Just a bit at a time. If you have it all together and in the machine, just put a bar between the arm and the pump housing and tweak it a bit at a time. You'll only be putting pressure on the trunnion shaft and bearing and it will take it. The arm is not that tough. Take the retaining ring off the opposite side shaft so you don't put inward pressure on that seal.
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