It can even be easier than that. Most of the good sandpaper you can buy has
lines on it for 1/2 and 1/4 sheets, or you can fold it.
Just screw the hack saw blade to the edge of your bench/bench leg in a
convenient location and use the lines/fold lines to make the cut ... no
need to make a base.
For some reason, neither method would work for me with either my
worn-out or my newer sander; the quartered papers is always about 1/8"
oversize making it hard to apply the hole punch on the width, and insert
under the keepers on the length.
So I have to fold mine into quarters, then just use an old pair of
snips to cut off about 1/8" on two sides; with that 1/4" total removed
they fit perfectly. I have a Makita palm sander - maybe it's metric<g>.
NBD though since I get a 4-fer with each sheet.
I have a similar arrangement that I created about 35 years ago. It is inside
a cupboard door where I store my sandpaper, I have multiple blades set to
quarter a sheet or cut to fit a sander I have. Put a thin washer under the
hacksaw blade when driving in the screw, the space makes it easier to slide
the sheet under the blade without snagging.
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