I had all sorts of issues with chatter and stuff coming loose on my 3 in 1 mill/lathe. I got it with a 3" vice which weighs about 25lbs. I figured it might be the vice causing me a lot of grief so I looked around for an upgrade, the only thing I could find that could possibly fit and that I could afford was a 6" vice that weighed about 100lbs and cost $190. It didn't bolt on either, had to make a skirt clamping device. Man does it make a difference though, nice smooth operations now. The tooling never ends, next I need a bigger lathe chuck, then DRO. I need to raise the tower up an inch too. For what I'm doing now I can live with a 3 in 1. When its time to grow I'll find an old bridgeport.