has anyone successfully unfrozen a 61 tachometer? it is not the tach itself but the female end in a tube behind the tach. --where the cable attaches . would it do any good to drill out the brass brad or rivet that seems to go to the center and stop.car has been idle for nearly 30 years but you would think the parts would be brass or aluminum and would not corrode. thanks. pat grant [Non-text portions of this message have been removed]