Helicopter blade angle checking tool.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...le_checker.jpg
Previously:
https://www.homemadetools.net/forum/...524#post135942
https://www.homemadetools.net/forum/...024#post145074
https://www.homemadetools.net/forum/...955#post164273
https://www.homemadetools.net/forum/...330#post185156
https://www.homemadetools.net/forum/...797#post129117
