Clausing Drill Press Question

I’m new and have a question about the Clausing drill press. I see the crank to raise and lower the head, but no locking pin. While the posted manual, and those posted to the entire interweb, is a fantastic example of mid-century technical illustration, I can’t find a lock.
Is there a lock?
Is there a secret password?
What is the procedure for this?

There is (2) 3/4” bolts on the left side of the column. Loosen those two & use the handle crank to raise it up. Tighten them back up before drilling.

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Thank you for that.