I added an adjustable spring perch to increase tension to the extruder lever. My extruder spring was getting a bit weak and causing extruder skipping which this solved for me.
3mm x 20mm cap or socket screw
3mm x 10mm flat head screw (holds the v-groove bearing)
I had much more success printing this at 10 micron vs 20. The tolerances have to be very tight and may required some light post processing.