How to make small-sized pole spears and Hawaiian sling spears with interchangeable spearheads. These could be scaled up easily.

Peter’s Research: http://www.tc.umn.edu/~asimons/peter-hundt.html
Peter’s Twitter: https://twitter.com/pjhundt

Constrictor Knot: https://en.wikipedia.org/wiki/Constrictor_knot

Supplies (most can be found at local hardware stores):
15mm Bicycle Spokes – check eBay
#10-24 Stainless Steel Coupling Nut – check eBay
PC-7 – http://amzn.to/1P1ih7P
Driveway Marker – http://amzn.to/1gXDODV
Stainless Steel #10-24 Machine Screw (bolt) – http://amzn.to/1Mg2FxY
Quick Set Epoxy – http://amzn.to/1L1Yw1P
Stainless Steel #210 Screw Eye – check hardware store
3/8″ OD 1/4″ ID Latex Tubing – http://amzn.to/1MYe8ns
Paracord – http://amzn.to/1f3KaQ7
Braided Fishing Line – http://amzn.to/1L1Zyeg
3/4″ PVC and fittings – check hardware store
5/8″ ID Nylon Hose Barb Connector T – check hardware store
8″ Releasable Ties – http://amzn.to/1gXFeOB