Mark VII Counter Shaft Breakdown

[JPG]

For lack of a better name, I refer to this shaft as the 'countershaft'. Its purpose is to impart rotation of the headstock positioning gear by way of a worm gear pair. It also has a clutch that allows manual positioning of the headstock.

A ring on the end of the shaft retains the clutch 'plate'.

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Removal frees the spring and clutch 'plate'. The plate has two pins that extend through the worm gear and into the spur gear. Moving the plate away from the gears withdraws the pins from the spur gear allowing free wheeling.

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The worm gear is also retained by a ring.

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Removal of the worm gear reveals the spur gear and the two slots which the clutch plate pins engage.

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An additional retaining ring does not actually retain anything. Since it appears the shaft is pressed into the headstock casting. I believe it's purpose is as a stop for that operation.

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