In reply to:

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The box lock has only the cuts for the cocking levers,and the slideing bar for engageing the bites in the lumps lock in the bars, the tumblers, sears, and springs are in the back of the action.

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That's a new one on me!
All the boxlocks that I've had anything to do with have the mainsprings fitted directly under the action flats or water table.
They are housed right at the top part of the "box".
As such, metal has been removed from the bar to accommodate them.