I figure if the car is running great but you just want to change the plugs then screw an old one out and replace with exactly the same brand and heat range.
Back in the 70's, K Mart, Target plus Repco etc used to sell reconditioned sparkplugs for about 1/3 the cost of new. They were sandblasted clean and regapped....thats all. They sold heaps - but back then you'd have to clean and regap your plugs every 20000km or so as your carby was probably misadjusted and running rich etc....of course petrol was 11c a litre....
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