Here are my DropFo 4" and 5". I just purchased the 5" on Monday. I looked up DropFo in the vise info spreadsheet, and there is a brochure posted as well.
In the sales brochure a 3" version is listed as well as two different 5" vises.. one i called Heavy Duty.
Looking at my newly acquired 5" version, and taking it apart for a good cleaning, I think this vise was never intended to be a swivel base.. The stationary jaw/body in the 4" vise has a slot milled in it, and when either the swivel lock screw is tightened, or if something is tightened between the jaws, the taper on the mainscrew nut spreads the vise body, expanding it and locking it to the inside of the bolted down base..
But this 5" vise does NOT have the machined slot in the stationary jaw/body.. So the mainscrew nut cannot have any effect on the size of the body / base interaction.
The stationary jaw/body appears to have been pressed into the mounting base.. There is no indiction that the base has ever swiveled.. There are some machining marks on the top surface of the base, where the body of the vise would rest and rub when it was swiveled,, and there is no indication of it every have been touching or moving..
So: what do you guys think? Do you think the 'Heavy Duty' version of this oddball vise is this version: a non swiveling version to make the main body much more solid and rigidly mounted?
The stamped 'DROPFO' is SO AMATEURISH on these vises.. Looks like a 4 or 5 year old was give an handful of letter stamps and told to stamp the name on the jaw's surface..
The 5" vise has two rectangular insets on the back of the fixed jaw. Cast into the recessses can be seen the poorly defined word in the top recess: PART No And in the lower recess a ?? and 'IN" So I'm assuming it's 5-IN..
Virtually no wear on the vise parts that are forged.. But the 'meatball' on the main screw handle is pretty badly wallowed out.. I'll remove the handle and braze in a bushing when I have some time..
The 4" I have just put paste wax on the vise to seal and protect from rust.. i think I'll do the same on this one..
PierceA