I still don't get it, if the glow plug is installed, how can you see it is not glowing, and how can you feel it is not hot? Unless you removed the button and head from the rest of the engine and looked inside, if that is the case, it isnot making contact.
This sounds like a tunning issue, if it is popping over a little.
Good luck, I will bow out now, I can't handle explaining how to tune, via a keyboard again.