I'm sure someone will know the answer to this, but it's got me stumped – what is the extra screw on the rear side of a Boxford (Model C Bench type) for? That's the slotted on in the photo.


Pretty sure it's an original fitting – the hole it fits into is plugged by something that does not appear to be removable – no slot or hex recess – so it just sits there, sticking out about an inch and a half.
Thanks,
Rob