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What holds the cylinders in place?

JohnM wrote: Tue Feb 15, 2022 9:05 am What holds the cylinders in place?
CACFAE4D-A3D9-4823-AC33-E9C5DFAF69F9.jpeg

The "stop or detent" mentioned in the description, and shown in the upper left of the drawing (Fig.4).

- Bill

Does any one know if this was a patent only or it went into production. ?? Neat cylinder holder.

This was a duplicate.