My oscillating disc sander has
built-in dust collection and it works great — but only when the holes of the
sanding discs are aligned with the vacuum holes in the sander’s pad. This simple
requirement isn't always as easy as it sounds. Rather than rely on a good aim
when installing the discs, I put together a simple tool that makes hitting the
mark a sure thing.

As you can see in Figure 1,
the tool is nothing more than two dowels glued into a small block of wood. The
diameter of the dowels and their spacing in the block matches that of the holes
in the discs and sanding pad.
To use the tool, you simply
place a disc over the dowels and then insert them into the holes in the pad (Figure 2). Slip the disc off of the
dowels and onto the pad and you're ready to go.