Nah, not a must. Silicon grease- the non-conducting stuff- splatches around the plug seal is evey bit as effective. Costs £2.99 for a tuibe that'll last for years. But an extenda is still a good thing to buy, helps protect the engine casings from impact and filth. A good thing with the SV's less-than-brilliant engine paint.
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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