Easy and very commonly done.
Mount the Heilar or any similar barrel lens on to a Sinar lens board. Install on the Sinar front standard, use the lens barrel aperture as needed, use the Sinar shutter settings as needed. Ignore the lens aperture scale on the side of the Sinar shutter as it corresponds to Sinar DB/DBM mounted lenses only.
Example with a 210mm f3.5 Heilar on a Sinar P2 (makes zero difference for Sinar Norma, F/F1/F2, P/P2/X or ....).
View of the lens rear and lens board, long as the lens barrel clears the Sinar DB/DBM aperture control pin, you're good. The rear of the lens can sit inside the Sinar shutter's opening which is about 15mm deep by ? diameter.
BTW, 5x7 Sinar F2 is a rare camera, curious to see a picture of this Sinar.
Bernice
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