I haven't tested it myself, but there was a test of various filmholders back in the 1970s or early 1980s in one of the magazines like Popular Photography or maybe Modern that claimed that Grafmatics had better flatness than standard holders.
I have three 23's that I use in my Busch "C" and they also work with my new RB67. I have a good size collection regular 23 and 45 film holders but found the Grafmatics very handy.
Curt
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