Quote:
the ensuing aperture must be for a reason
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Sure, but if it is indeed only for inspection it only needs to be large enough to see the conductor inside the terminal or the terminal entry hole and the smaller it is, the neater and the less tendency for dirt to enter the plug. Hence the convenience of filling up the unneccessary top 1/8" of the notch with a locating lug on the cover.
Lucien