Here is a fun little game for all you do-it-your-selfers. How good are you at estimating things like centers, bisected angles, and the sort of stuff that allows you to cut out the gears for an all-wood clock, for example, without a pattern
In 2 tries, I got down to 3.1. 3.1 what, I'm not sure. Percent, from the look of it. Good enough to put me on the good side of the results curve, but not as good as I believe myself capable of.
Give it a go.