Well AVB, I finally sat down and drew up to scale the Briggs ride on bolt pattern, then over layered the Briggs push mower bolt pattern and then the Chonda pattern from the three with the measurements on them. The holes in the Briggs push and Chonda line up except that one hole is a mile off , it is on the opposite side, but the other 2 are spot on. As for the original one I queried I have not been able to get a bolt pattern detail, but from what I have been able to work out it is just some random bolt pattern somebody dreampt up, like we will put a bolt hole here and another one there
