I will be building one rob I trust your opinion on that
Good. I'll begin the tutorial as soon as the dial indicator arrives in two dayze.
This is a hanging spine meter, meant to be attached to a wall or some manner of supports because a bit of height is needed in order to hang the required 2lb weight. A tall stands/legs could be fashioned if need be.
Some components ...
Wood board - I use a 1x6x30 pine board (actually 3/4" x 5-1/2" x 30")
Two hooks, about this size ...
Dial Indicator -
https://www.amazon.com/gp/product/B0BN5NR7FR/?th=1I use a plastic vitamin bottle filled with shot for the 2lb weight, but any exact 2lb weight will do just fine.
Sticking the indicator to the board will be accomplished by using the indicator's backside attachment hole to fit a 3/16" or 1/4" x 3" bolt through it and a pair of supports that are added to the board. This allows the indicator to be removed, if need be. Once the indicator is secured on the board, the hooks can be installed and their depth that's screwed into the board can be regulated so that an arrow shaft will sit on the hooks and the the indicator's probe will rest dead center on that shaft.
Lots more to come, probably in a new thread .....