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I don't know what kind of fish they have around there. Might not have heavy enough fishing line. You'd need about 60# monofilament to get it through the sheath. Have you ever tried to push a string from the back end? 30# multifilament would work if you could get it through, and it's limper than mono so it willl knot better to make ends. But the challenge wlll be getting something through the sheath.In SD, weedeater line might be easier to find in a suitable gauge for getting down the sheath. Ends can be brass crimp beads if you don't have any luck making knots.
You must have some skinny tape. Any rumors of the op?
Haven't seen a post from Kevin lately. Did the problem get taken care of?