Del Rawlins wrote:

Even my
substantially built lumber and plywood benches shift around more than I
would like during small forming tasks (yeah, I could bolt them down but
my small shop needs to be readily reconfigurable).

I had the same problem with my main woodworking bench, which has a maple
"butcher block" top and rock maple legs. I took care of it for the most part
by building a removable cabinet for my small power tools that fits on the leg
stretchers. This only covers half the stretcher area, so I added a shelf on
the other half. Two loaded machinist's tool boxes on the shelf keep the bench
down pretty well.

If you don't have enough heavy stuff to do the job, a few bags of sand would
work just as well.

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.