I bought a Swiveleze 3/4" pin type seat base, floor base, and basic boat seat and all work fine. The problem is the extension pole,adjustable 25"-31", is way to tall to sit on. I am 6' tall. I measured out that a 18" extension pole would be right for me . The 13" they sell is way too short. So if 18" is right does anybody know who sells a approx. 15"-21" extension pole? Or has anyone come up w/ a custom solution? I am putting in regular seats, not the bass boat style butt seats/leaning post. At the lowest 25" setting I could not even get close to sitting in this chair. Thanks for any and all input.