The fuller is actually round (or perhaps elliptical); in cross section it is a segment of a circle. The chord across the segment is the width of the fuller. By cutting the depth of the fuller in half you are reducing the length of the chord. This would be very easy to illustrate on paper.

Thanks! :smile:
That's a very good definition of the english word diameter.
In other words, both the fuller's width and depth were reduced! :wink:
I would then suggest we could change this bayonet name from "LanCay shallow fuller" into "LanCay diet fuller" :grin: :grin: :grin: :grin:

It is only the diameter if it crosses through the center point of the circle. For this to be the case, the depth of the fuller would have to be 1/2 of its width. I do not know if that is the case. A chord is a straight line that connects two points on the diameter of a circle or curve. Hopefully this diagram will sufficiently explain.

http://www.quarterbore.net/forums/ph...er_diagram.JPG

Bill,
no other words:
G R E A T !!!!!!!!!!!!!!
Seems like we are a mathematics forum :grin: :grin: :grin: :grin: :grin:
...just kidding, of course!
P.S. at the end, the width and depth of the fuller are still both reduced! :grin: :grin: :grin:

Congrats on the fullered LanCay!! That it a beauty!!!
I know you are HAPPY! :nanabang: :smile:

I'm still waiting for my first fullered Lancay.

iam too, it looks immmaculate.
a good buy!!!!!:smile:

Thanks for all your comments and information. This bayonet completes my 1st production collection and just about wraps up my hunt for Lan-Cay’s in general.
For me, the odd thing about “collecting” is that the Wanting or Hunting for something is much more fun than the Having …:smile:
Thanks again.