Great experience to share with your dad. He must be a pretty good.machinist.
Thanks John- Dad is an exceptional tradesman. He ran a tool and Die/Manufacturing shop with his brother in the late 60's early 70's. When they were putting an addition on the shop he decided they needed a better way to hang the drywall that a pair of 2x4 T's
This was one of his early models:
He refined the design and had it patented
It was further refined over the years and is now manufactured in several models-
Two of my Brothers run the Business with Dad where they continue to design and manufacture a wide variety of products---