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I will find out in due course whether the extra elaboration in fitting the Z axis with the optical read-out has been worth the added work. I did it partly because I liked the 3 axis LCD screen monitor that Machine-DRO offered as a package with the three optic bars. I had wondered about using axis 3 for a small travel readout mounted on the quill. But it might be neater, if I want a read out on that, to just fit one of the small battery powered digital read-outs that are quite cheap. Dave