I'm having some problems with the glow plug connectors on my AMT engines. I'm not sure what brand they are. The are brass and they have a hole that fits over the ball on the glow plug, with a little detent ball that is supposed to hold them onto the glow plug head. Problem is the balls on the Rossi glowplugs are really inconsistent. I've measured them from .065" to .130". Despite this problem, the Rossis seem to hold up better than some of the others. Are there better glow plug connectors out there?