Trace around your coupler onto heavy card stock.I'm using a very thick mat board material using in picture framing
TIP: Ask for scrap mat board at a framing store. They usually have smaller center pieces left over from custom framing orders. You can buy it for next to nothing or if they have a lot - it's free! Perfect for centering rings and baffle disks as shown here.
Cut the circle out with sharp scissors on the pencil line. If the edge isn't perfect, don't worry about it. It'll be round later when sanded to the coupler edge.
Mark a circle around the outside about 3/16" in. Use the edge of the disk as a pencil depth guide.
Mark the circle in half, quarters then eighths.
Use those marks to punch eight holes with a 1/4 hole punch. The mat board is thick but the hole punch will still go through it.
The smaller center holes were made with my rotary punch. My standard hole punch wouldn't reach the center.
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