Simple is often the best, and the patent filed by Frederick E Blodgett in 1911 is the spiritual ancestor to the Blackland Sabre you can buy today.
Described – as most patents – as a new and useful improvement on the state of the art, it was described as a:
…combination of a flat, single-edged, apertured blade, a fiat holder plate, a flat guard plate, means for positioning said blade with respect to said plates, a threaded locking handle for locking the three, and a guard or comb on said guard plate; said positioning means comprising a pair of lugs engaging the blade back edge and a threaded lug engaging the blade aperture, said threaded lug adapted to be engaged by said locking handle.
US patent 1,017,199
As shown by the Blackland Sabre, this method of construction works – with a couple of minor and obvious modifications – just as well today as it did almost one hundred and ten years ago.
Full patent available on Google Patents, as usual.