Why come up with a simple solution when you can make something overly complex… 
So i decided to try out the glancing blow switch mounted on the bottom integrated with my new vacuum mount. Since I had to make a new vacuum mount that did not limit my travel but still nested behind the core. (Which is very tight now…) The switch seem to make good contact and i can pull my heads out without worrying about the switch. I think i am going to go the route of just building a full z assembly for each major tool.
Yeah that’s 4 x 1" aluminum tubes acting as my vacuum… 
Still waiting on parts so wont know how it works until then.
Assembly seems good and doesn’t bind anything up on dry fit.