Thanks for the comment and yes simple it is and easy to calibrate to get a exact fit .
I found that if it says 1/4" on a blade doesn’t mean that it will cut exactly 1/4" when in my table saw so I came up with the idea of being able to fine tune the advance on the jig to match the blade cutting width .
With a screw advance or fixed index like a threaded rod that can be difficult as the index from a 3/8" x16 tpi would give a 1/16" increment so I came up with this solution which kept it simple to build and adjust .