If you use an Autocord finder frame and want the Hassy finder to fit in, you'll need to grind away much of the bottom flange on the Hassy finder. Won't fit inside the frame without it. Drop me a note if you want a frame to use.
This is my daily beater these days, Autocord with Hassy NC-2 prism scabbed on. On this prism the flange is actually a steel frame held on by screws. So I simply unscrewed it and the prism slides right into he focus screen frame after removing the moving parts. No need to grind the flange. The 45 degree prism is very nice- corrected view, sits against face with a nice angle, rests in hand smoothly with focus knob and shutter release falling nicely in place. Look for Kiev prism if the NC-2 is too expensive (I bought this years ago during the 'great hassy dump' early 2000s so paid maybe $15. A guy who shot Hassy pro from the 60's practically cried when I told him what I paid for it; he paid $600 or so).
The prism needs to be raised approx. 5mm to actually focus on the screen. With the chimney, I think the focusing range of the eyepeice takes care of this, but still probably best to raise it. I used some basswood strips, 1/4" by 1/4" (or was it 3/16 x 3/16?) to raise it up.
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