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f.
In the Framing the Tunnel procedure (page 14), you should have opted to leave at least six extra inches
of ridge pole and purlins protruding out from the endwall. If you did not, follow this procedure:
i.
Cut the swaged end of a scrap piece of top-rail, so that the non-swaged portion is 6" long.
ii.
Insert the swaged end of the scrap piece into the end of the ridge pole.
iii.
Using tek screws, secure to the ridge pole from the sides.
g. Slide the T-clamps on the end of one of the
rails over the protruding ridge pole outside
the end-wall of the tunnel. Add the second
rail in the same way. Drill a tek screw into
the side of the ridge pole just outside the
second T-clamp to prevent it from sliding
off. Cut the ridge pole to length just outside
the tek screw.
h. On each scissor rail, measure from the top
of the swage (as it is hanging) to an inch off
the ground. Cut two extra pieces of top rail
to this length and add onto the bottom of
each rail. Secure from both sides with #10 x
3/4" phillips self-drilling tek screws. The
scissor rails should hang freely and be able
to rotate out to the sides of the tunnel
easily. They should also should not touch
the ground but come close to it. If they are
too long and hit the ground, shorten as
necessary.
i.
Holding the rails together, align them with
the center of the baseboard and clamp
them securely in place.
j.
With a 1/4" bit, make a pilot hole through
the outside rail first, then through the inside
rail. Re-drill and ream the 1/4" holes out
with a 3/8" bit and continue all the way
through the baseboard. Then, ream the
holes i
n the scissor rails out with a ½” bit.
k. Insert a 3/8" x 6" fully threaded carriage bolt
through the hole in the baseboard with the
threads facing outward. Secure to the
baseboard with a 3/8" wingnut and flat
washer.
l.
Slide the rails onto baseboard bolt to make
sure they fit correctly, and secure finger
tight with a 3/8" wingnut.
m.
Optional:
Add a section of wire channel
along the top edge of each side of the
baseboard. This may be used in winter to
seal up the end of the tunnel (see first
picture on previous page).
2.h.
2.i., j.
2.i., j.
7617.999 Rev 06/21/2021 | AL, JG, ms