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Installed this left lead screw on my C4 mill and the threads matched up perfectly with the existing nut. The machining is clean with no burrs, so everything slid into place without forcing anything.

This replacement left lead screw fit perfectly on my C4 machine, and the mounting holes lined up without any extra filing. The machining on the threads is clean and consistent, which saved me a lot of adjustment time. Exactly what I needed to get the old unit running smoothly again.

The threading on this replacement lead screw is clean and precise, making it a perfect match for my bench top mill's C4 assembly. I had it installed in under ten minutes with zero adjustments needed.