Cardboard and toothpick contour gauge.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...tour_gauge.jpg
Previously:
https://www.homemadetools.net/forum/...631#post136436
https://www.homemadetools.net/forum/...131#post134443
https://www.homemadetools.net/forum/...660#post132900
