Bob please chime in on this..... Just came across a shot I took around 1980. To take the image, I had to borrow an extra long center column for my Linhof Heavy Duty Tripod from a friend (who I've lost touch with). The extra long center column is my question.

Did Linhof make some sort of an adapter that allowed one to attach 2 normal center columns together?
or
Was the extra long column just taken off a Linhof Copy Stand?
or
Was the extra long column a custom fabrication?

Will be taking some shots for our town's museum come spring and need to raise the maximum height of my Linhof Heavy Duty Tripod by maybe 2 feet.

thanks