This dispenser is a nifty way to hold rolls of sandpaper. Plus,
it makes it easy to pull out just the right amount of sandpaper and tear off a
piece. Each dispenser consists of a short length of 4" PVC pipe and a cutoff hacksaw
blade, as in Fig. 1. The sandpaper feeds out through a slot in the pipe.
The easiest way I found to cut this slot is to use a ¼" straight bit in
a table-mounted router. To prevent the pipe from rotating during the cut, clamp
a scrap of wood to each end, like you see in Fig. 2. It's best to cut through
the pipe in several passes.