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ualdayan
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The lead screw has been doing good – the original nut developed some wear and I ended up buying a split nut antibacklash one instead ( http://www.ebay.com/itm/322207703521 ) and as it wears the spring takes up the slack. The top part is kept from spinning by the legs coming down the side, so it can move up and down but not spin.

Even with the worn nut though I wasn’t really seeing any effect on my cutting though – just that I could move the Z assembly up and down a little without turning the screw. I don’t know if it was the weight of the tool/Z assembly holding it down during actual cutting that made it not cause problems with cutting, but I just didn’t like the play being there so I got the antibacklash nut anyway.