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Takes two minutes to remove the sparkplugs, might as well check the plug gaps while your feeler gage tool set is out at that point.
With the plugs out the engine is so easy to turn even if you use the fan belt to turn it.
BTW , you can legally mail a potato through the USPS by writing a mailing to and return address with a sharpie and a few stamps. It’s recommended you take it in the post office for actual weight though.