The CDWG is best applied with spray glue such as Scotch 77, a small can of which is about $7 at any hardware store.
Each driver requires a pair of the foam and plastic parts. When attached, the black, hard plastic section will face up. Lay the parts on some newspaper or similar surface with the gray foam only surface up. Apply a coat of glue and allow to dry for about 45 seconds. Turn the part over and attach to the mid panel with the top edge of the gray foam just covering the top silver-headed screw holding the panel to the baffle.. The long edge of the CDWG should be flush with the outer edge of the panel. Do the same to the other side of the panel. The completed panel with waveguide should look like the picture below. The opening formed by the two parts should be about 1" wide and centered over the diaphragm.
With tweeters, apply the spray glue to the gray side of the WG and attach. On the spiral ribbon the opening (slot) should be about 2/3" wide. On the FST, which is already narrow enough for CD behavior to 20kHz, the opening is a little larger.
If you need to remove or reposition the parts, heat them with a hair dryer or heat gun on a low setting, and the glue will loosen. Be sure to listen with the grillframe removed for best results.
When you are done installing the CDWG's peel the protective brown paper off the acrylic parts.