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Mechanical tach drive assembly

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Healey Nut

Healey Nut

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Does anyone have a parts drawing of the mechanical tach drive assembly for a BT7 Tri Carb .
I cant find one on any of the supplier sites .
im looking for the top oil seal and the tach drive spindle and gear . The one that goes in the side not the main cam gear .
 
Taking a second look at this , does anyone have a close up pic of the “thrust button “ that goes holds the pinion gear in thrust and also is the tach drive pinion gear the same as the speedo pinion gear on the the 100/6 gearboxes ? .
 
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