Hi folks;  Is there anyone that can tell me where the four notches are
cut in the channel board to the bottom pipes in a Wurlitzer style 146
organ with bells?

It looks like I have two options to do this when adding bells and I'd
like to do it like the original.  Each notch allows four bell tubes to
pass through.  Wurlitzer 146's with original bells are kind of rare.

Thanks,

Mike Kitner
Carlisle, PA