While reorganizing some of my model airplane stuff I found a old still New in Package Wen Mac Glow Plug.






I also found a couple of old Cox .15 glow plug heads like this one too. Check out the price way back then. I remember thinking it was expensive at the time.


I was also surprised to find a old NIP Cox .010 glow plug head too. It also has a price tag that is interesting from years ago.



Years ago someone used to make special Cox .020 glow plug head adapters for letting one use short glow plugs on a .020 engine.
I forget how it works now, but I think the adapters tended to lower the compression which resulted in a power loss of course. This glow plug adapter head was actually made and was not a drilled out converted standard Cox .020 glow plug head. Now of course maybe this glow plug adapter head is not for a Cox .020 engine. it might be for a old K&B or Ok engine near that size displacement.