I've just acquired a Sears Craftsman model 315.174451, which doesn't come up
in ANY Google Web or Groups searches or the Sears web site.

I understand how to use it, but I cannot figure out the red and white
rotating bezels for setting the depth of the cut.

The white part has the depth settings starting with 1/64 - and between 1/64
and 15/64 there is a 0. That white ring rotates independently from the red
part, which rides up and down on threads.

Above on the main body is a little arrow pointing down with 1/64 on it. I'm
pretty certain that's a calibration guide of some sort, but it just doesn't
make sense to me.

And the white ring has tabs on it which contact that 1/64 arrow, which stops
the white ring rotation about 1/8 before it reaches the top of it's range.
Weird!

If anyone in this group is familiar with a router that uses a similar
system, I could sure use some help!

Happy New Year to all!