Hi all
Just to close the loop on this one. Over the holiday, I finished the repair to my top slide. I took Martin Johnson's advice (option 2); basically removing 1/4" from the end of the slide, and re-boring / tapping the holes for the gib adjustment screw.
There was a slight interlude involving a broken screw………….. and a broken screw extractor….which required a visit to a local spark-erosion specialist. (It's very handy to live near Coventry, where such services are readily available).
Just today, I made a replacement screw. It has a 1/2" diameter head and a 3/16 BSF, threaded section, 1" long. I thought I might struggle to turn the thin section, but I followed some advice on Joe Pieczynski's YouTube channel, which worked like a dream. All in all, I'm happy with the result.
Next job, make a new dial that reads 0 to 2.5mm to replace the one graduated 0- 2.0mm.
Thanks once again for the advice and support.

Edited By Andrew Cox 3 on 03/01/2020 12:11:23
Edited By Andrew Cox 3 on 03/01/2020 12:11:49
Edited By Andrew Cox 3 on 03/01/2020 12:12:21