Step 7: Mount the Aluminum Angle on Hardboard
Take one end of your sheet of 1/4" hardboad and clamp the aluminum angle so that your panel with guide is fully resting on the large panel. To help ensure straightness of the angle while you mate-drill the angle to the panel, clamp a level or another straight, long piece of material to the side of the angle. This will aid in keeping it straight.
With the aluminum in place, drill holes evenly spaced along the length of the aluminum angle at approximately every 6 inches. This frequency will prevent your aluminum from flexing during use.