I've been testing the rub test on larger males and have accurately felt the "bb" on males over 5 1/2' now. I've actually found with large males it is far easier, as I gently grip the tail above the vent and put slight pressure while sliding toward the tip. I wrap my index finger underneath the tail with the thumb on the top of the tail.
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Randall L Turner Jr.
Boas make the world go round.

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