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Old 13th February 2025, 08:25 AM   #18
A. G. Maisey
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Join Date: May 2006
Posts: 6,964
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The radius is to create a scraper cutting edge.

It is such as is found on a mechanic's bearing scraper.

At the moment I'm not at home, & will not be until March, then I can post a photo or two.
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