(30th Jan) Interesting and annoying at the same time

In conducting some measurements for a 6 point cage last night, I've just found out that my existing 4-point Schroth harness is not compatible as a 6-point harness, nor is it compatible with a HANS device.

Take a look at these x2 pics (below) of the left handed shoulder strap harness.
You'll see there's an embroidered join on it. Apparently Schroth do this as STANDARD on all 4-point harnesses to prevent "submarining". In the event of the strap being subjected to excessive force, the embroidered strap is designed to stretch and break, thereby allowing your torso to "bend"
It is for this precise reason it's not HANS compatible , as the force of an accident where you'll really need the HANS could trigger the seamed join to break and then the HANS doesn't work!
Bah!
(click to enlarge)