Randy is correct, the 81-01 processor requires the 81-05 holders, no tray required. You have to slip the positive in at the other side of the dark slide
The 81-06 holder requires the 81-12 or 81-22 processor with loading tray. My 81-05 holders don't fit in my loading tray ... caveat ...
I have both systems ... long story ... lol
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