Mark Stansbury: The DropFo vises have been mentioned here for quite a while. I posted a message about my 4" one about 10 months ago. Then posted another message about acquiring a 5" Heavy Duty DropFo vise.
And recently, a few weeks ago I acquired a 3" Dropfo vise.. So I'm hoping to find a 4-1/2" version to complete the product line..
I really like their advertising showing the workman with a 3' cheater on the handle, implying that the vise could and would take that type of abuse..
Below find images of my 3", 4" and 5".
From reading the ads found and posted here and there, I thought ALL Dropfo vises were swivel-enabled. BUT now I own a non swiveling 3" and a non-swiveling 5". And the method of retaining the mainscrew nut is different.
On the 3" vise, the nut is apparently the same as the ones on the larger vises, but since this one is a non-swiveling version, the nut is pressed into the base, and there are 4 large peened-over edges overlapping the end of the nut, keeping it in place.
The 4" one has the split machined in the static jaw, and is held in place by the smaller swivel-lock screw, under the mainscrew.
The 5" has the same type nut as the 4", but the static does not have the machined slot, instead the static is pressed into the base and will not rotated. The nut has a square-headed forged bolt inserted under the mainscrew just like the swiveling base version.
PierceA