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3. Build the Strum Box
 The
strum box serves two purposes: It smoothes the
flow of water into the intake hose and strains
out any large debris. To make your strum box,
use a hack saw to notch the rim of a 11/2" end
of PVC coupling. The notches should be about
1/4" wide by 1/4" deep and evenly spaced.
(I used a table saw to cut my notches. I set
the blade height to 1/4" and set the rip
fence to 3/4". You can also use a round
or a rat-tail file to make the notches.)
4. Drill
and Slide
The next step is to drill screw holes in the bulkhead and slide the pump
into place.
 • Stick some double-sided tape on the back of your jig and position the
jig in the location you decided on in step 1.
• Drill the four mounting holes through the bulkhead using the jig as a
guide.
• Remove the jig from the bulkhead, and check that the pump screws slide
into place in the bulkhead.
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