Woodpeckers storey stick

[glenfield2]

Amateur hobbyists buy gadgets.
I just think it's interesting that nobody seems to know what "dividers" are for, in spite of the clue in the name.
Now waiting for someone to ask how do you divide, precisely, with dividers.
The answer is that you divide the error by the divisor.

I know that - and I know about storey sticks and ticking sticks but sadly I’m still a pretty rubbish woodworker. I’d be even worse without my power tools