The power switch is interlocked internally to prevent reversing direction without pressing the stop button. The key lock adds to that interlocking. The key must be in either the forward or reverse direction position in addition to the corresponding switch button being pushed. The lock also prevents any power switch depression when the key is removed. The lock has three positions - forward - off - reverse.
This shows the cam that is moved by the lock. The cam when moved away from the switch button(s) allows that button to be depressed.
The key interlock parts.
This shows the motor mount is different from the Mark 5/V in that one side is screwed to the front of the motor pan and the other side to the bottom of the pan.
This thread is linked to from http://www.shopsmith.net/forums/showthread.htm?t=11373
Mark VII switch interlock lock and motor mount
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Mark VII switch interlock lock and motor mount
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
╟JPG ╢
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange