I think that this approach is probably the best that I've seen. I've tried many different approaches with dealing with venting these newer containers and most times still get some spillage from the vent because of its low profile and getting the angle right to fill whatever I'm filling. With this method, the extension of the valve stem offers the extra height in venting that a greater tip of the container can be accomplished.
Check out this link: https://www.youtube.com/watch?v=0lcnwdIYEfI
That's my 2½¢ worth of brain activity.
Ron
I've been wondering how to fix a bunch of new cans that I almost thought about tossing. Seems like a easy way to fix them. Gonna give it a try. Must say though that the amount of gas he keeps in his garage in the video is on the dangerous side.
UnionMan