ALL: the anvil on these vises is not nearly as sturdy as a nice piece of RR track. in my opinion this vise is more of a sit on the shelf and not a user. also for those of you that want to hit cold steel on a REAL anvil please don't because that is how you chip the edges. you should only hit hot steel on an anvil and the better blacksmiths even warm up their anvil some before using it. check out the blacksmith threads in the fabrication section and if you don't see your answers just ask questions and some of those guys might know because they are awesome and turn out some pretty cool stuff.
i've seen a lot of these vises with broken mounting feet, broken anvils or jaws and the screws usually don't have any grease on them so the threads on both male and female parts are probably a bit dicey. like i mentioned probably a piece of art more than a user.