I installed a grease nipple in one side and would periodically shoot in a BIT of grease per side
The "best" grease fittings , that are OK in a bilge, come from the outboard dealers , not NAPA.
Both sides of the fitting could use some grease.
Folks that dont trust grease fittings can simply unscrew the 1/8 pipe winterizing plug , screw in the grease fitting , shoot and replug.
Doesn't take much longer , and is perhaps a bit safer.
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