For sale is this Beseler CS-21. Everything works as it should and is very solidly-made. The column can decouple from the base for easier transport/different mounting positions. The mounting screw (pic #2) is the standard tripod size (1/4-20).
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The only defect is a burn mark on the front edge which can be seen in the first photo. This is merely cosmetic and does not affect performance of the product.
The base is 22 x 28" and the column is 45.5" from the table on which it stands.