wrote:
Dave Butler wrote:

crankshaft? Does anyone have a picture or drawing or explanation?

snip

http://www.sacskyranch.com/detune.htm

Thanks, TC, that's extremely helpful. Unfortunately it also raises some more
questions... forgive me.

In the first picture at the top of that web page I was thinking the
counterweights were the two objects that look like ears in the picture, with 3
round things in each (pins? bolts? through-holes?).

In the nest-to-last picture at the bottom of the page, those things are called
"plates". Are the plates the actual masive part of the weights?

The caption to that next-to-last picture says "Pin diameter determines the
pendulum length and thus the frequency." I'm having some difficulty visualizing
that. Can you clarify that?

In that next-to-last picture, do the weights (plates?) rotate around one of
those pins to do their job? If so, it looks like they can't move through more
than a very small angle. True?

Thanks again.