Not sure if this has been mentioned but, I've found something which has helped me tremendously. I remove the very tip of the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]BM[/words] (the clear part with the holes, along with the little black pressure release piece). I stick my rubber piece for the vacuvin inside the hole where the tip used to be. It actually fits in there pretty good and I don't have to hold it to keep it in. All I have to do is pump and it instantly pulls a vacuum. I'll try to snap a shot of what it looks like.
Here is the piece I have and the two rubber pieces it comes with: