In the previous post, I mentioned a slight vibration in the clutch assembly.... well, it quickly became apparent that we had to fix this vibration. There was a lot of testing, brainstorming, and trial solutions, but eventually we realized that there was no fix-it solution - we had to cut out the coupler and start again. The problem was in the weld between the shaft coupler and the flywheel. It turns out that the coupler wasn't completely flush and level with the flywheel when it was welded on...
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