I read your post and understand it perfectly. I didn't comment on the spiral side of things as I didn't deem it relevant.
A spiral however is a 2d shape a spiral stair case is in the shape of a spiral when veiwed from above and a helix staircase is completely different structure design to a spiral staircase but anyway that's off topic.
The only reason people commented on the heater heater plug comment was probably down to the fact most people whether mechanically minded or not know them as glow plugs. But instead of saying do you mean heater plugs? I know them as heater plugs (which is no
problem at all) you continued to try and correct a person asking for
help by saying his terminology was wrong when undeniably it is for all that have probably now double checked 100% relevant.
I apologise for saying they both have the same purpose since clearly they do not albeit similar in nature.
I hold my hands up and say I've never heard them referenced to as heater plugs but if you asked me about them I'm pretty sure I'd say I know what you meant and I wouldn't dispute the terminology of someone unless they were 100% wrong.
Not sure where the technology comment has come from but don't worry I use a map book half the time.
Unless you mean the old google, ok I have in front of me a VW manual glow-plug warning symbol which lists as Glow plug system (alternative to EPC). So there you go hard copy. Same as the guy above posted he has references to both so I say ok neither is wrong both right let's move on.
Shame this is well off topic since the first bit of advice regarding the lamp not illuminating for a faulty heater/glow- plug spot on.
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