All that is left to do now is mount the driven element to the boom. For this I used 1/2" aluminum spacers and 6-32 machine screws.
Make certain you have the dipole placed at the correct distances from the reflector and first director before drilling the mounting holes in the boom.
The picture below shows the completed 4' antenna, held by my trusty XYL (she's still shaking her head).
You may not need to tweak at all, but if you do, SWR is affected by the shape of the dipole (height). You can also bend the ends toward or away from the reflector as an additional adjustment. You should be able to get the antenna down below 1.2/1 at mid-band, and below 1.5/1 at the band edges.
If you plan on stacking Yagis, and need to flip one of the
antennas over, you can put that antenna back in phase without having to make a
'mirror' dipole. Notice that I have the DE mounted so that the balun loop is
toward the reflector? Just mount the DE so the balun loop points the other way.
This will put it back in phase with the antenna on the top. You can see this