I designed an adjustable endstop for the tevo to be compatible with the ninjacookie dual Z brackets, as there was no option for those who have mechanical end stops.
it's not perfect. I have 2 screw holes for mounting to the base extrustion but only one will work becuase the t nuts interfere when trying to mount with both screws (still works fine)
Use a m4 screw, T nut, and washer on the x carriage extrusion to contact the switch (see picture)
Its very close to the y sled so if your hot bed wiring isnt snug under the bed, it might catch.
- I am using this on a Tevo tarantula with the large build area upgrade.