As Tinker said, do the fixes in the Cheap z-axis fix. I also recommend sanding the inside of the router housing and the channel the index pin rides in as in the post below. I also use dry graphite lube that sprays as a liquid and drys immediately. I don’t have these issues with my z axis now. I’m going to switch mine over to the Meticulous z axis because as previously mentioned the housing and origianl parts aren’t designed to be used this way but, they can work good enough on a budget! Also as stated make sure your travel height will not run the top of the bushing into the frame holding the height screw.
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