Locking grease gun coupler.
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Previously:
https://www.homemadetools.net/forum/...853#post217016
https://www.homemadetools.net/forum/...226#post172719
https://www.homemadetools.net/forum/...594#post205640
https://www.homemadetools.net/forum/...205#post149916
https://www.homemadetools.net/forum/...983#post229991
