Eric - the "Loft"
Interesting with the mortise on the Whorl.
It was designed to just slide up to spin the toggle, then drop back into the frame - saves angling it to the side as you spin it.
You could slide it out completely and get an extra half turn if you needed it (Can't say I've ever needed it for that, but might on a larger frame).
HokieKen
Excellent work and great write-up Mike. Thanks for taking the time!
Cheers Kenny - did you ever get around to buying the knew concepts saw?