Simple fret bender with fine-adjust

I've created what for me is a goldilocks fret bender, combining the simplicity of jm7905's three-bolt fret bender with the fine-adjustment of the very expensive design sold by StewMac. I machined mine out of ali on the CNC router but I'm sure it would lend itself to 3D printing as well; may just take some tweaking to get the tolerances right.

Parts you'll need:
Base and slider - machined from a length of 50x10mm flat bar or printed in your favourite flavour of plastic
6082 bearings x6
M8x30 screws x3
M8x1.0 washers x9 (note that the thickness is important here; I tried standard 1.6mm washers initially but they allowed the fretwire to twist)
M6x20 screw x1 - this is to fine-adjust the roller height
M6x10 screw x2 - these are optional but I use them as a depth stop to help position it quickly in the vise