Well, no new input on the list but a couple direct emails. Thanks to those
people for a few pointers.


Summary: the patent indicates that the ring is held in place by forming the end
of the collar after it is inserted. A members experience indicates that the only
way to get it apart is to remove the end of the collar to get the ring out, and
that reassembly may be impractical.

Now I need to decide if, for what is a user, a) I go with the existing chuck as
is, with the rust and roughness, but firm holding, b) I adapt a spring collar
chuck from another yankee, c) make a new chuck to match, which might be
interesting in its own right, or d) open the end of the collar to get it apart
and figure a way to hold it together, possibly pressing an annular ring into the
end.

Any input will be welcome and considered.

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