Sir:
I found many years ago that oil by the gallon like WD-40 is cheaper than small cans of three in one. But, how to get the oil from the gallon jug to the small can?
I took about four inches of surgical tubing, and pressed it onto the end of the squeeze can. Hold the small can with cap up. I took a small pill bottle, and filled it from the big gallon jug.
Hold the small can upright, and put the end of the surgical tubing into the small bottle of fluid. As I squeeze the small can, bubbles blew. When I released, fluid came back into the small can.
I’d be squeezing air out, and the fluid stayed in the bottom of the small can. I could refill a small can in a minute or less. – C.A.Y.