On Friday, April 8, 2016 at 5:13:07 PM UTC-4, Bill T wrote:
I'll check my manuals, but as I recall, it only specifies rated strength of a weak link. Not the brand name of "TOST".
BillT

There is an FAR that stipulates that any aircraft - experimental or standard cert. - shall be operated in accordance of the manufacturer issued POH. The 80-200% rule only applies to aircraft that do not have that detail written in their POH. So, the POH defacto becomes an FAR.
As for Tost or not: the weak links are well engineered and time proven devices, so if you can build a better mouse-trap, good luck. I have heard of gizmos using penny nails and similar as force limiting devices. If the sheath that protects the weak link takes a beating, you can slip it into a piece of clear plastic hose.
Uli