Apparently it's a "common" problem... aand normally just a very simple fix of realignment with two screws.
I rang Fe$tool and repeated my now often used line of "You can never say that again!", when he said to me "I've never heard that before."... accordingly, I was the first that had to sand a tad... all others complaints had sufficient clearance.
Actually, that tripod is quite handy... I can lock stuff in it and wheel it around the workshop... though me being a shortarse, the extra 120mm height took some getting used to... I believe in large(ish) wheels.
If your first cut is too short... Take the second cut from the longer end... LBD