Adjustable tension carriage (Max Micron and other Prusa i3)

••this is still in development- any constructive feed back is welcome••
(I'm currently using version 2, version 3 has only minor additions but let me know of any issues please)

Got tired of the difficulties installing a properly tensioned belt on my Max Micron printer. It's either too tight or too loose. And then the add on type adjustable tensioners mostly are prone to breaking or "lean" the belt. then the springs and arch type clip on tensioners cause vibrations and/or bind the movement o