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Finding center can be frustrating when you are in the shop and need a quick way to place a biscuit or dowel or mortise.
This simple math trick does the job for you.

Drill two holes in a piece of 3/8" thick stock that are 2" a part and exactly the size of your selected dowel material
The center hole should be the diameter of your favorite pencil stock.
All the holes must line up along a straight pencil line for this to work.
Drill a hole dead center between the previous dowels for the pencil.
If it's a bit loose set a screw through the side of your wood to hold it .

That's it!

By placing a dowel on each side of your wood and running down the stock with the dowels touching the sides you will draw a line dead center on the work.
You may want to stack more layers up to hold the pencil so the sharp end doesn't protrude as much.

Enjoy Bob



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Thanks from me as well for this post, Bob. I'll be making one for sure.