Will allow two handed sharpening with pull or push option depending on file direction.

Knob & button designed to both be printed together @ 50% speed with 0.3mm layers. Knob end will deform if printed faster.

Knob: Tap metal nut into place and glue. May need to clean hole with a 8mm bit.

Button: Press into place.

Handles: Printed @ 100% speed. Smooth edges with a file & sand paper if necessary. Square handles may be used on either end.

Slower printing speed will make the holes slightly larger.

The terms square & flat are relative for the purpose of easy identification.

Chainsaw bar oil spout: http://www.thingiverse.com/thing:1764433 Chainsaw bar support: http://www.thingiverse.com/thing:1749225