las tI know the vs2 stock feedneck did not tighten onto the hopper. maybe you have an aftermarket one?
If it's the stock one you can did what I did once when i was in a pinch. I used thick paper, like a business card, something like that. Slide it down the feedneck then put your hopper in. It wont' be as tight as if you had a clamping feedneck, but it worked increddibly well. I've done that several times.
Just put some duct tape around your loaders feed neck and jam it in their. Belive me, it works.
No I was talking about the stock feedneck. You have to screw a ring on the feedneck to get it tight, but it can be hard to screw. A solution is to lubricate that ring, which help alot when the feedneck is hard to get tight.