Here is a sacrificial board I made to protect the waste board.
This is my third one.
I used the specs of Inventables for the hole spacing but made the holes .5 inch to allow for variances
with remake title
https://easel.inventables.com/projects/sxZ5nwu18nwFrYKK8sQsTw
This is the one folks are looking for.
Martin Gutzmer