Here’s my take on the bench screw(s) of Moxon & Holme. The “single bench screw” is the one fitted through the piece fixed to the front edge of the bench. For edge-planing and similar applications I found I need some way to support the other end of the stock & I opted for a “deadman” that slides on runners attached to the lower rail of my bench & the bench top’s underside. I have NO EVIDENCE for the deadman in the 17th-c reference material. So that is a case where I stole something from a later period… the deadman has a row of holes, not for holdfasts but for a peg on which to rest the nether end of the stock.
The screw in this device can’t grab the way a vice can – it’s really just to pin the stock against the bench’s edge. If I have to really hold it tight I use a holdfast in the bench’s legs…
For edge planing of stock that fits on the bench top – I use the “double bench screw” described by both Moxon & Holme. Instead of thinking of this as a precursor to a vice, I think of it like a clamp, in essence, it relates to the handscrew of the 19th & 20th centuries; except in this case, both screws move in the same direction, and the action is quite slow. But it holds.
I have two. One made by me, one by Alexander. Mine is smaller, about a foot & a half long maybe. I use it to prop stock up on edge oin the bench top, for planing the edges of boards. Sometimes I set the back end of the stock up above the wooden screw, and tilt the forward end of the stock downwards against the bench hook. Other times, the double bench screw is just grabbing the end of the workpiece with the two inches or so beyond the screw. I use it a lot this way, for planing, to steady pieces under the holdfast for mortising. I also use the double bench screw to hold tenoned stock upright on the bench top for splitting the waste off tenons, after sawing the shoulders.
Now back to Moxon. I think that Moxon’s illustration of the double bench screw is not reliable for scale – remember that he talks about planing stock that is 7 feet long – so if his bench is say 8 feet long, then the double bench screw there is what, about 4 feet long? Seems awkward. But who knows?
My take on the notion of attaching the double bench screw to the front edge of the bench top is that it’s hokum. I see no reason to try to do so, I can’t understand what operation would leave a joiner needing a device like that. Remember, joiners did not regularly dovetail stuff, rarely if at all. When I need to really hold stock upright, I blam it agsinst the bench legs/front edge of the bench with a holdfast in the leg.
So that’s my view. I have used a bench like this for almost 10 years now. Almost never use a vise for anything; and certainly not for joined furniture. You just don’t need it. I started out using a modern Ulmia bench with two vises; and making the shift away from that was intimidating at first. But once I threw the switch in my head that told me it would be difficult, things went smoothly. The toughest stuff to hold is small-dimensioned thin stock. but there are ways…
Another fitting that Alexander & I both use, but have no period evidence for is the wooden bench hook – (not to be confused with the toothed planing stop that in the 17th century is called a bench hook) – this one’s the small board with cleats fastened at opposite ends of oppsite faces. It hangs against the edge of the bench for sawing tenon shoulders; and for paring tenons’ cheeks. Oh, yea, I shave pegs on mine too. I finally retired this one, & made a new edition. JA & I would love to hear the history of this bench accessory. 25 cents to anyone who can provide it with documentation.