These tubes with the center, shaped black plastic pin that fits into the socket holder? This piece on my Russian 6H13c disintegrated. I have a couple of questions:
1. Does it serve any purpose, beyond guiding the tube to the proper pins to sockets?
2. Can I still use it if the metal pins all look good.
3. So if I mark between the 1st and 8th pin(if I'm looking on another tube, the dimple is between 1 and
, will it work?