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Spark plug caps?


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Hi All,

I have got a box of these, has anyone ever seen them before? Any idea what they are used on? They came with some motorbike bits so I’m assuming that that may be bike related 

I’m pretty sure they are spark plug caps, however they must be for plugs with a very small diameter ceramic as the hole is only 10mm

The knurled bit with Smiths on is a captive nut that screws on the top of the plug. The last picture is a set up with plug ( too big) and HT lead with olive and nut. 







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