Ah wonderful, the old grooved plug stunt. I inherited a two set but fortunately never needed to use them. One had a single groove, starting at the second or third thread, this allowed for certain indexing with the head.
Number two plug had four grooves diametrically opposed to each other. A couple of petrol soaked pipe cleaners would be placed over the tip & run down the groove to clean out any dirt left in the threads as it was screwed in. I’ve no idea where they are now.
On Cobber’s comment on plug collectors; the place to go if your fetish is spark plugs is the Shuttleworth Collection at Old Warden airfield near Biggleswade. Here there are display cases full of every conceivable type. The entire collection is worth a visit or two.
Whilst tractor technology was little more than a four wheeled mechanical horse, the plugs had to be regularly removed, stripped & cleaned, especially if the engine was using TVO. A bit of a fag for an agrarian whose life had been spent looking up the arse of a horse.
To digress. It’s bloody cold up here, bloody cold. I went to bring some logs down from the top store, when I tripped over a hose pipe I didn’t know I had. It turn out to be a piece of heat shrink I’d dropped the other day.
M

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