Now that was sorted I could tackle the other bug bear. You loose about half the micrometer travel as the way shields keep the end stop about 7mm from the saddle, plus the end stop can be wound into the casting !!! Solution, make an extension, in this case add a 4mm socket bolt and sleeve to extend the tip. I also ran a tap through the casting as it was pretty rough movement and then re-greased everything and ground the pip off the location grub screw as it would just catch the micrometer dial making it snag. This also let the grub screw sit lower and reduce backlash in the dial. It now has a full 20mm of travel and very handy it's been now its much better to use.