So I cleaned up this vise and wow is the action butter smooth easy one finger spinning open and shut, feels great now.
C Parker No. 87.
But I need your help: how is this thing supposed to be mounted to a workbench? Is the bottom plate supposed to go on top of the table or is the tabletop supposed to be sandwiched?
I got a Parker similar to yours and it is a royal PIA to mount.
Here is how I did it:
The base plate with the counter sunk holes goes on top of the table, counter sunk holes up.
To secure the base plate:
Drill holes to match the pattern of countersunk holes in the base plate. Depending how thick your table top is the holes can either go through the top (secure them with nuts), or drill the holes the right size to serve as pilots and drive flat head screws into the table top.
I drilled four holes through my top, used flat head bolts and secured them with washers and nuts, my table top is 1/4 inch steel. I guess they want you to use six screws/bolts or why else have six holes.
Once the base plate is secure, drill a hole a bit larger than the center screw through the table top at the hole at the center of the base plate. The end of the threaded rod with the lease amount of threading screws into the bottom of the vise. Screw the rod into the bottom of the vise.
Set the vise on the base plate with the rod running through the center hole. Get a piece of hardwood about 4 x 4 inches and thick enough to extend beyond the threading on the free end of the center rod, and drill a hole through the wood that will allow the center rod to pass through the it.
The stack from top to bottom:
Vise
Base plate
Table top
Hardwood "shim"
Nut for center rod
Screw the nut onto the center rod. To swivel the vise, loosen the nut and turn. To secure the vise, turn the nut TIGHT.
There has to be a better way...