Sherry, I think a prerequisite for the 4-vise setup on the homemade equipment forum might be to have four identical vices. Otherwise, you'd have to compensate for any minor differences in the heights of the vises.
Leslie's email address is
LeslieStones@hotmail.com or you can get it from her profile by clicking on the sunglasses at the top of her posts. Better call ahead for a visit. I drove through Waxahachie last spring yelling, "Leslie, where are you?" and never did find her.
A manual underpinner/v-nailer is one that doesn't use a compressor. It relies on "foot-power" or, sometimes, hand-power to insert the v-nails into the frame. Some people feel they get more control than they do with a pneumatic underpinner but, for old farts like me, it's too much work.
Here is a link to the original 4-vise post of the equipment forum. Unfortunately, the photo of the setup seems to have disappeared. The idiot who posted the photo may have deleted it from his server, though I can't imagine why. I'll investigate further.
http://www.thegrumble.com/ubb/ultimatebb.php?ubb=get_topic;f=10;t=000005;p=1
Edit: As I suspected, the photo is gone for good, unless I can find it on the hard drive of the computer I was using in 2001. (I think that would be the Kaypro 64.)
I'm sure there's a lesson here. I'll get back to you when I figure out what that might be.