Two height gauges have been salvaged after conversion from dial-reading to digital-reading. The measuring height has been reduced from 300 mm to 150 mm, which is more convenient for my work.   

2. This project starts with two height gauges with broken counter mechanisms, but with fully-functional  vertical movement mechanisms.
Rear view showing the up/down hand wheel.  As time permits, plans call for replacing the plastic wheel with one of higher quality. 

4.  Close-up of the  rise/fall mechanism.  Up/down movement is accomplished by turning the hand wheel, which turns the pinion,  which engages the rack.

5. Originally, a rack was machined into each shaft, one for the rise/fall system, and one coupled to the dial counter. The converted, digital system, retains only the rise/fall system. 

6. The upper connecting bracket and aluminum cover plate were temporarily removed to allow for cutting the shafts.  See photo #9, below. 

7. Unnecessary parts removed. The movement of the main body was checked and found to be smooth.
The pinion gear for the rise/fall operation and a plate spring is installed.

9.  Shafts cut to desired length as a pair, since they are  press-fit in base.

10. Squaring and finishing bandsaw cuts in milling machine.

Great care was taken to pack the shafts to avoid bending or marring. 
Making the upper and lower scale fixing brackets. Cut four brackets from the block . The raw material is a casting.
The scale is fixed centering in the completed bracket. @

13. I wanted to make the base a little more compact, but gave up after not finding a good way to accomplish this while maintaining structural integrity.

14. New foot installed, giving new life to an old broken height gauge.

15.  The remodeled  gauge on the right is considerably more compact and easier to use on smaller jobs.