I bought the fixed length one from Force 4 ( 66 cm). It is plenty long enough for me on my 3 metre Takacat. I felt the telescopic ones were too long for my set up, 80/110 cm, and 90/140 cm respectively. The fixed length one has two tightening screws to fix, and so far, has felt secure. I’ve only used it, so far, in fairly calm conditions, so can’t comment on rougher seas. It certainly helps to balance the boat better when solo.
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