[Dick So. Cal.]

How did you know I was an engineer-type. We recognize beauty in function, like you said.
The two notches in the housing are mostly covered up by the t-stat, that is why I asked.
The thing I also liked about the set-up was the fact you didn't loosen the head bolts to access the t-stat. And at the rear of the housing are two access ports for both mechanical and/or electrical temp sensors. I thought the whole concept was really nicely thought out even if it is a bit odd looking.
Dick