I've never tried this. I'm making it up as I go along. Get two thin
strips of metal, thin enough that they can easily fit side by side into
the copper pipe. I’m guessing they should be about 11 mm wide and 8 mm
thick. One of them should be cut short, like about 16 mm long. The
short one will become a hook on both ends. One end with a point and
the other with a sharp edge where it was cut off horizontally. The
second strip should be long enough to be used as a handle to push the
short one into the copper pipe and to pull the copper pipe out when the
hook is set.
Drill a hole near each end of the short strip. One hole should be big
enough to hold a bolt or a piece of thick wire, like baling wire. The
hole on the other end of the short strip should be smaller, to
accommodate a string or fishing line. Grind a shallow point on the end
of the short strip nearest the small hole. On the long strip, drill a
hole to hold the bolt which will connect the two strips.
Connect the strips together using baling wire or a nut and bolt. The
bolt must be well shorter than the interior diameter of the copper pipe
because it will be going into the copper pipe in a horizontal position.
Make the bold as short as possible, barely leaving enough room for the
nut. The nut must be left loose enough that the hook can rotate on the
bolt freely. Glue the nut onto the bolt with Loctite or any other
Run a long piece of string or fishing line through the small hole in
the pointed end of the short strip. The string has to be loose and has
to be long enough so that both ends run outside of the drain pipe when
the hook is lowered into the copper pipe.
Pull the string ends so that the pointed end of the short strip
furthest from the long strip is pointed upward as the assembly is
lowered into the drain pipe. Hold the point upward as you lower the
assembled strips into the copper pipe. Shove the assembly in well
enough to be sure that the short strip is fully in the copper pipe.
Pull out the string, releasing the short strip hook. The hook will
fall against the inside surfaces of the copper pipe so that both ends
touch the pipe with the pointed end a bit higher. When the string has
been pulled out, jerk sharply upward on the long strip to set the hook.
Don’t let up on the upward pressure or the hook will have to be
re-set. Pull up on the long strip, pulling the copper pipe out.
If it doesn’t work the first time because it doesn’t grab, adjust the
length of the short strip. Cut a bit off if it remained too vertical
to jam into the sides of the pipe. Replace it with a slightly longer
strip if the hook was set but the upward pressure forced the hook past
the horizontal and it slipped out, non-pointed end first.
Let us know how it works.
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