re: Wagon Vice

Cheers - I think the important bit of info I missed out is Use a drill press/guide, my holes weren't perpendicular enough and I ended up reshaping the blocks to match the holes, would have been a lot simpler if they'd been at 90 to start with.

I'd have been alright with an auger bit I think (Didn't have one big enough), but I'm not quite accurate enough to freehand  a 4" hole with those centre bits.