Originally Posted by LugNut
"I use a strap wrench to hold the balancer while torquing the crank bolt."
That's unfortunately a really bad thing to do. The harmonic balancer has a thin elastomeric ring separating the hub and the dynamic mass/pulley. You've likely damaged it. New OEM ones usually cost $300 or so, retail ...
Well All I can tell you is this-Page 303-01E-141 0f the Ford workshop manual figure TIE0009662 shows a strap wrench holding the crankshaft pulley as it is torqued to 120 Nm.