If you have one of the original style caps in which the connections are
made by screwing a pointed screw into the high voltage wires, make sure
the pointed screw is really getting to the center of the wire. Maybe
pull the wire, screw the screw down with the wire out, and check to see
if the point extends far enough. I've encountered a cap in which the
threads did not get put in far enough, so the screw in contacts just
missed reaching the conductor. It worked for a while, but the spark
jumping eventually eroded things to where it started missing.
Ray Gibbons Dept. of Molecular Physiology & Biophysics
Univ. of Vermont College of Medicine, Burlington, VT
gibbons@northpole.med.uvm.edu (802) 656-8910
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