How the "Grease Gun" works.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...k_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net..._guns_work.jpg
Previously:
https://www.homemadetools.net/forum/...386#post219054
https://www.homemadetools.net/forum/...429#post177507
https://www.homemadetools.net/forum/...652#post132853
https://www.homemadetools.net/forum/...536#post205333
https://www.homemadetools.net/forum/...8809#post88163
