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Joseph Gwinn Joseph Gwinn is offline
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Default Lamp Repair using a Rigger's Constricting Knot

On Dec 10, 2015, Joe Gwinn wrote
(in article ):

In ,
whit3rd wrote:

On Tuesday, December 8, 2015 at 6:28:11 AM UTC-8, Joe Gwinn wrote:
Yesterday, I noticed that the lamp hanging over the kitchen sink was no
longer hanging by the woven polyester cable sheath (which is intended
to carry the weight of the lamp fixture) and was now hanging by the
electrical wires. Which were coming undone -

So, I replaced the metal ferrule with a double constrictor knot made of
nylon cord, all well daubed with Pliobond rubber cement.


Sounds good, and it's likely the rubber cement won't attack the
materials. I'd have used hotmelt glue, and instead of a knot, just
a wrap or two of a nylon tie-wrap. Anything you can get tight, that
stays tight, should work at least as well as the original did.



I'm going to make a metal clamp ring, modeled on the commercial cord
clamps.


I have made and installed a machined 0.5 round brass sleeve with a
perpendicular round-face 1/4-28 setscrew in the center, used to clamp the
cable. The braided sleeve is very rough, and the sleeve fits over it
perfectly. This is one standard design, most often implemented in plastic. We
will see how long this lasts. Should be forever.

Joe Gwinn