Stevo's Playhouse

The jaws of the vice go out of parallel easily, even given the depth of wood the bolts are going through and the tight clearance of the holes. I may epoxy the bolts into the fixed jaw or think of some other guide mechanism.

I have just learned about vice rack stops after spotting someone use them in a video on Youtube.

https://www.leevalley.com/en-us/shop/tools/workshop/workbenches/benchtop-accessories/69605-vise-rack-stop?item=09A0235

I think generally they are to stop the moving jaw racking from side to side when clamping at one side of a wide vice. I need something similar to stick in the underside when clamping something across the top of the vice. I have some 3mm hardboard so might cut a load of squares and stick a small bolt through one corner of a stack of squares and use that.