Parametric arrow nock

This nock should be equal or superior to a professional nock bought from an archery shop. Features:
- Fully parametric so will fit your arrow spine and bow string perfectly
- Rounded cutout to aid arrow placement on string
- Bump to find what arrow side should point away from the riser when the arrow is nocked to the string
- Protrusions to "lock" the arrow while you aim
- Rounded nock floor to prevent string fraying
- Knobby protrusions for fastening to arrow without use of glue (protrus