bwpigeon

Easy, make a new spring, all you need is some 1" or 1 1/4" spring stock or an old spring. heat it re curve it to fit and them quench and temper it. If you have a forge and anvil make one. You have all of the tools you need. That is what blacksmithing is all about.

Cole vices are not for blacksmith work. I have several and use then all the time. They are for gripping, not hammering. Take a look at the jaws, if they have replaceable jaws, they are not for blacksmith work. Blacksmith vices were designed with solid jaws and not replaceable. Which means not usually damaged by beating on them with a hammer. True blacksmith vices were designed with that in mind. Bear in mind that any vice can be damaged by hammering on it. Especially if you do not lock the vice and beat on it while it is open. This is a good way to damage the gripping edge. You don't have to ask me how I know, I think my dad's boot print is still in my butt for doing just that.

I have several of these, it looks like you are missing the second wedge, there should be one driven in from each side. Look at the length of the slot in the mounting plate there should be enough room to fit in the second wedge.