Lou, I use a similar method to get the ether from the John Deere can of starting fluid. I shake the can go out side and holding the can inverted spray out the propelant. Then in the freezer for a while to cool down the ether. Then back out side and I also use an awl to puncture the can in two places on the top. One to pour out the contents and the other for a breather. I place the awl aginst the can and strike with the heel of my palm. But I always have got 8 ounces of fluid or 6.4 ounces of ether assuming 80% ether. Jack