What kind of wrench do you have? I assumed it measured torque at the head, but apparently yours measures it else where such that putting an extension on it changes things

Good thing you read the manual :P instead of listening to losers like me
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Michael 
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS