I've taken measurements with borrowed digital gauge between off-the-record and off-the-platter and they were different by .03g so the pressure difference isn't that huge after all.
Spacedeck and stylus force guage
I am setting up a Nottingham Spacedeck with Spacearm I recently bought used. The instructions with the Spacedeck say to use scales directly on the mat. The instructions with my Shure SFG-2 stylus force guage say to place it on a record. This will result in a huge differance in pressure. Which is correct?