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If you google "vintage oil gun" you'll see syringe type things that look like grease guns - the main difference is the washer, which is double acting in an oil gun - draw oil from an open can by pulling the plunger, deposit it by pushing. My late father-in-law had a selection (different sizes and end fittings) for use with his stationary engines. I think they were popular pre-war and largely superseded by pump action oil cans?
Oil port on a 1950s frame - How do you use this?
Do you need an old oil can to fit the port or is there something else to use
Thanks