Good questions Ad...here is a pic of Chris Caracci's interpretation of the best CQB lanyard for the Vietnam Tomahawk.
After Chris' explanation, this lanyard has become ATC's suggested approach to using a lanyard with the Vietnam Tomahawk. The hole itself is only .25", but it is chamfered or countersunk out to .50"...allowing for two strands of 550 paracord to run through it and not fray from use. The actual hole is .50" from the butt of handle. The stretched loop is 5.5" from the butt of the handle to the inside of the braiding. This is adjustable depending on wrist size.
This lanyard, while fundamental to weapon retention, allows for VERY smooth and secure grip changes on the Hawk from "hammer-style" to a reverse grip...the Hawk uses the lanyard as an axis and spins up and down. Yes, Caracci has devastating techniques to teach in the reverse grip with the Vietnam Hawk.
We have not found a structual problem with the hickory handle...on our synthetic handle, it's what Chris calls an "easy day".
The downside is that the lanyard does make the Hawk a bit tricky to throw. Even if you don't have your wrist through it, the flapping around of the lanyard does influence the flight of the Hawk and make it a bit difficult to get the Hawk off the hand when throwing it...it's not impossible...just tricky.
Chris' braided band on the lanyard makes it EXTREMELY comfortable in use...providing a very stable wrist platform on which to make the grip changes, or use the Hawk under high torque...it is very similar to the wrist straps found on some of the finer ice axes.
We expect to have more info on Caracci's high speed approach to Vietnam Tomahawk Combatives.
Hope this helps!!!