From an Ebay auction, the name Van Eps rang a bell, and I discovered I could search US patents by name... and I found this:
http://www.google.com/patents?id=nChpAAAAEBAJ&pg=PA1&dq=us+patents+van+eps&source=gbs_selected_pages&cad=2
I wonder if someone could build one of these from scratch? I've tried doing eccentric lock grooves using a worn cutting stylus trimmed down and wedged into a craft circle cutter on a variable speed Lenco turntable, but my success rate is only 50 percent, and noisy when it does work.
Van Eps eccentric leadout cutter US Patent
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- EmAtChapterV
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Re: Van Eps eccentric leadout cutter US Patent
Why would you want to cut an eccentric locked groove?
- Angus McCarthy
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Re: Van Eps eccentric leadout cutter US Patent
To re-create the old Victrola runout groove that would trigger their return mechanism, of course.