[Geysers] F&M - What's a "Lock"?

[Bob Mabery]

I read with interest the detailed descriptions of the varied cycles of Fan
and Mortar.
Is there someplace that I can read a definition of the elements of the
cycle, perhaps with photos?
For example what is a "lock?"
BobInGA
          *W4YBB *
*    "Y*our *B*uddy *B*ob"
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