I used to have one of those enlargers! I custom fitted the 6x6 carrier with a mat board dirty border 35mm opening and I made a slot where I could slip my Stouffer step wedge and show one step. This made a makeshift densitometer out of it (I'd use an enlarging meter to null on a part of my negative, then pull the negative carrier out halfway to show the step wedge. I would slide the step wedge back and forth until I found the step where the meter nulled. Then I knew my range). Ah, the good old days, never could do that with the D-II
My wife still kids me about the Minor White Zone System Manual because I keep leaving it out. "Haven't you memorized it already?"