Detailed plans for a trichotometric indicator, available for free download.
https://s3-us-west-1.amazonaws.com/h..._indicator.jpg
Measurements are specified in both imperial and metric, so assembly requires one of these specialty wrenches:
https://s3-us-west-1.amazonaws.com/h...ent_wrench.jpg
:rimshot:
Previously: https://www.homemadetools.net/forum/...ws-chart-56763