I was at Harbor freight the other day looking at cheap throw away stuff. I noticed the ultra sloppy mill vises they have for around $70. I was wondering if anyone has ever tried to tweak one and make a real mill vise out of it or are they just total unusable garbage? Without buying one and playing, I was thinking better screws and maybe playing with the dovetails, gib's and what not. They are super lite weight so it would probably be almost useless for anything but the smallest jobs. I'm thinking of giving it a go just for fun. I can always use a new anchor for the boat anyway. Has anyone ever tried it?