Other than size and color, this picture describes them perfectly. 2 finger action, one thumb action.
I tested each of them with Light Cutting Oil and none of them pump. I find it strange that all three of them are bad although I guess it's possible that whatever seals are used in the pumping mechanism could have dried out in all of them. Same material, same time frame, so maybe I shouldn't be surprised.
Unless it's the Light Cutting Oil that they won't pump?
I'd like to get at least one of them working so I can use it for my Drill Press and get a little part of Grandpa helping me out in my shop.
Any thoughts on how to go about fixing these oil cans?