Applying
glue to the tube ends didn’t strengthen the cardboard enough for long term
durability. Adding cloth strips imbedded
in glue resulted in a very strong reinforcement. An old pillowcase was sacrificed and when the
cloth was embedded in carpenter glue, the final result was similar to
fiberglass.
The
tube “raw” cardboard, after stripping the wax liner, needed strengthening and
smoothing to interface with the insert on the upper ring, to permit smooth motion
when the ring is turned. A couple of
coats of clear spray lacquer worked well, followed by light sanding with 120
grit paper. Finally, candle wax was
rubbed on both the insert and the tube interior in the area where the two
surfaces meet, giving the upper ring a smooth but snug motion.
A
set of 12 Bungie tie downs cost $8.00, providing a simple way to hold the upper
rings to the tubes.
cloth
strips/glue reinforcement applying
glue cloth imbedded in
glue spraying clear lacquer
120
grit sandpaper applying
candle wax marking 120 degree
points measuring down for holes
drilling
5/8” holes bungie ready to
insert attaching through
holes bungies at 120 degrees
looking
upward inside tube