I saw a picture of something like this. I have a old South Bend 9A. The cross slide vernier dial is small and worn. I was pretty much not able to make repeatable small incremental changes. This mounts to the cross slide base using the mounting holes for the follower rest and reads cross slide movement.
Will
![01143561d39f5072285c25cc37c8c190812242b5ec.jpg 01143561d39f5072285c25cc37c8c190812242b5ec.jpg](https://www.hobby-machinist.com/data/attachments/414/414097-88f28cce68eaf5d0c2b342de65c75b05.jpg)
Will
![01143561d39f5072285c25cc37c8c190812242b5ec.jpg 01143561d39f5072285c25cc37c8c190812242b5ec.jpg](https://www.hobby-machinist.com/data/attachments/414/414097-88f28cce68eaf5d0c2b342de65c75b05.jpg)