I suspect that rubbing lines of bees wax on the back of the
sand paper will work as well. One of my mentors was a jeweler
and used an old drop forge to stamp parts. The male and female
dies (sp?) have to be perfectly aligned or they explode when
the drop forge hammer drops - not a good thing. Had a small die
set (male & female matched dies) that we just couldn't get
aligned in any of his die holders. We went nuts trying to come
up with a method.

Then an old drop forge operator we found showed us The Trick.
The male die was clamped in its holder. But the female die
just got a little bees wax on the bottom and stuck on the
anvil - close but not perfectly aligned with the male die.
The old guy put a piece of linoleum over the female die and
let the hammer fall. The female die was able to move just
enough to be perfectly aligned with the male die.

Stamped a lot of Hitler In A Hangman's Noose overlays for
Zippo lighters using The Trick. We used that trick for the
Tojo In A Hangman's Noose overlays as well. I guess
Mussoline didn't warrant an overlay.

BTW -this was done in the '70s and not during The War (as
opposed to "police actions", "incursions", "temporary
invasions", "shadow wars", "contras" or other "actions").
I'm old, but not that old

Anyway - try the bees wax trick before spending $19.95
plus shipping, handling, undercoating, floor mats,'
taxes, licensing fees etc.. PLUS the refill costs.

charlie b