Originally Posted by
TheLoneWolf
...the Kevlar cord appears to be the secret or key element. One might spend time sourcing a supplier of the kevlar cord and then it may cost additional with buying more cord than needed.
Sourcing may be easier than you think. Sailboats use all types of fancy ropes these days all under different trade names with slight property differences, but all strong and low/no stretch. Ropes made from materials such: Kevlar,Twaron, Technora, Spectra, Dyneema and Vectran are the most common. All are sold be the foot at your local sailing supply store.