I'll measure mine this afternoon and post it along with the serial number. I think I may have a later version. My black "top" on the CLS2000 has what looks like a factory installed plate where the hose would connect.
My CLS2000 has two fans inside the housing. Are there two fans inside your 2000? I read somewhere that the second fan on some 2000 heads attached outside the enlarger to the other end of the hose.
Just over the weekend I was focusing an 80mm lens on the Tripla for a 40" projection and there were no problems with the focusing rails going up to the top of the head.
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