Longknife, sorry I didn't answer sooner, I only just saw your question.
Here's what we want it to look like:
Step 1: lay out your 1 inch webbing. I'm a pretty small guy (5'8", 150lbs +/-), my webbing is about 65 inches long (give or take).
Step 2: Place your triglide and feed it through, mine sit at 29 inches from each end with about 8 inches between the two.
Step 3: Now it gets tricky and may take a few tries. You want to create a loop like I show here. The best way I can explain it is lay your webbing flat and hold the triglide in your right hand, with your left hand turn the webbing over to the opposite side bu turning it AWAY from your body. Now re-thread it through the triglide.
Step 4: Weave the webbing back towards to loop to lock it in place.
Do the same for the opposite side but insert your tomahawk so it hangs in the shoulder loop. Adjust as required for comfort and ease of access.
Lacing the sheath with webbing will depend on the sheath itself. The RMJ and CRKT sheaths have 3 slots for webbing weaving and the RMJ pamphlet which comes with each hawk demonstrates the locking weave. If someone wants to see it, I'll post that as well. These images may provide some help: