This is a dial indicator mount for my E3D V6 mount found here (http://repables.com/r/338/).

If you are using this mount then you will need (2) #6-32" x 2-1/2" long machine screws cut down to about 2-3/8" or a little less. Plus, I bought a 4" dial indicator extension that I cut down to size. Length is up to you. Finally, you will need to tap the small set screw hole on the cylinder. I used a #6-32. Printed mine in PLA for a rigid part.

Attribution - Creative Commons

e3d, dial