Launch Pad Construction - Assembly
Now with the parts cut and glued, you are ready to assemble the
launch pad head.
Put teflon thread seal on one end of the sprinkler riser (threaded
pipe) and thread the pipe into the coupler (8) that has the piece of
pvc glued in and is drilled.
Slide the handle over the 1 1/4" slip coupler so that the hole
is down low. See picture below. Slide the two parts over the top of
the sprinkler riser and coupler. Insert the 1/4-20 x 3" bolt
into one side catching the handle, 1 1/4" slip coupler and
starting threading the bolt into the hole that was partially tapped
for 1/4-20. Continue threading the bolt through the assembly so that
the bolt goes all the way through the 1/2" coupling, the 1
1/4" coupling and the handle. Raise the handle all the way when
it comes to tightening the bolt. Just start putting pressure with the
bolt, don't tighten the bolt against the handle in the up position.
All three parts need to be centered. After the bolt is in place and
the parts are all centered, then put the 1/4-20 nylock nut on.
Tighten the nut with the handle up where the nut just starts putting
pressure on the handle. Don't tighten the nut very much because the
nylock will prevent the bolt from coming loose.
Assemble the sliding collar. Notice that the turnbuckle has one end
that is right hand threaded and one that is left hand threaded. Take
the right hand threaded eye out of the turnbuckle. Slide a washer
onto the bolt, slide the turnbuckle eye onto the bolt, slide another
washer onto the bolt and thread the bolt into the collar. If you have
a 1/2" long 5/16 bolt then use an extra washer to fill the
space. Test fit first. Thread the bolt into the washer until the end
of the bolt is flush with the inside of the collar. Test that the
collar still slides freely on the sprinkler riser pipe. When you are
familiar with the fit, which should be loose enough fo the turnbuckle
eye to move freely and take an angle of about 5 degrees. So don't
make this assembly too tight.
Repeat for the other side. Below is a picture of the assembly so far.
Now add the copper cut straps. Thread a nut onto the #10-24 x
3/8" panhead screw and tighten using plyers. The small hole at
the end of the strap gets screwed into the collar. The screw should
be tight to hold the copper strap and you may have to add #10 washers
so that the screw does not extend into the inside of the collar.
Check frequently that the collar slides freely on the sprinkler
riser. If it does not, then back the screws out and add washers until
free motion and the #10 screws are tight. Repeat for the second side.
You must permanently assemble the bolts and screws with either solder
or with the alternative Copperbond epoxy. Clean the copper parts with
a little steel wool where the parts are to be joined. I prefer the
soldering with a propane torch because it can be undone without much
effort. Take care not to solder or epoxy the free movement of the
turnbuckle eyes. The copper strap must be imobilized straight in line
with the collar center line. See picture. If you solder, then apply
flux to the tapped holes on the collar and on the outside of the
collar underneath the copper strap. Safety reminder: always have
water standing by when using a torch.
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