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I'm glad my '87 uses the regular 6 point bolt and big washer to fasten the cam sprockets to the cams.
That fine point crows foot wrench for the big cam nut on the early motors looks like it could slip off like you said if it wasn't held in place on the nut just right.. and it's expensive.
On the 930 the bottom two and top left motor mount bracket fasteners are bolts instead of studs like regular 911's so the turbo support bracket is easier to remove and replace when changing turbo's.
When I got my car the bottom two bolt threads in the case for the motor mount bracket were stripped. I installed time serts in the case for all 3 of them to make them stronger than new. I consider that an upgrade for a 930.
You can see the time serts in my top picture above.
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