On 5/5/2019 7:49 AM, dpb wrote:
....

There's somewhat under an inch left past the face plate; it has to have
sufficient clearance to be pushed inward by about a 1/4-3/8 inch to
engage the clock-setting function; so the knob can't use up the whole
length--hence the wish to extend the shaft somewhat again...the broken
pieces are roughly 5/8" in length...
....

The above I see is somewhat misleading -- that's to the face of the
clock face itself, not the covering face...there's only about 1/4" or
less past the outer cover.

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