my friend's herc was having the same problem. I think i may have solved it for her.
When rebuilding after a full cleaning, i squashed the ti coil flatter between 2 coins.
this made the whole thing wider and a bit tricky getting it down into the herc tube.
it also made the hole in the coil...
thanks for the video
so the resistance wire press against the insulating rubber. Will that damage it and/or short out? OEM has a connection of resistance and non-resistance (where one of mine broke) under the cup.
does the 74 have the same extension connector at the bottom of the heat shield, as the 71?
if so, that is where i had a connection problem. i needed the center contacts to push out the tiniest bit more and all was good