Sorry I did not mean kevlar thread but cloth, like fibre glass glass mat, I think they use it in carbon fibre car/bike fairings etc. Whatever they use, it is very light and can be a very fine weave. Maybe it's called carbon fibre cloth ! !. You could devcon it between the two halves of a split blank and leave the hinge part , where the joint is, bare (no resin). You could maybe even use a piece of old Nylon/Poly shirt, stand on that and try and tear it, or 'Ripstop' tent cloth, I'm really getting carried away now. pete
We have to think outside the box here.