You do need "case savers" for your head studs, but I have never had them for plugs or anything else. There is a special grease that you should apply to the threads of your plugs, but I am having a senior minute and can't think of what it is called.
See N64KR at http://KR-Builder.org - Then click on the pics "There is a time for building and a time for flying, and the time for building has long since expired." Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2004 - KR Gathering See our EAA Chapter 242 at http://EAA242.org http://www.krnet.org/info.html