If you can find them, Bromwell (no longer in business) made well machined lens boards for Sinar. 20 years ago they were often cheaper than used lens boards and worked fine. If you can find any of his recessed lens boards they are awesome. I like them more than the Sinar factory ones. They are a square recess instead of a round one. It allows for easier access to the Copal 0 shutter controls.
-Joshua
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