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The Mark VII has a release lever for the headstock moving crank mounted to it. That allows manually moving the headstock.

It is attached by two screws and tinnerman clips. The access hole is plugged like earlier Mark 5 of this vintage. This was supposed to allow oiling the floating sheave without removing belt cover.

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The inside-note the tinnerman clips, and the hole plug 'fingers'.

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The tinnerman clips drop into the holes making them a bit difficult to remove.

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That's all there is!

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Notice the 'mount' is tapered to match the belt cover slope.

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The knob is cracked.

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The brass insert makes that less of a concern.

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I will 'seep' some thin CA into the cracks anyway.

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