Which Head is This?

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Long time lurker, first time poster....

Does anyone know what head is on this ski? I'm trying to research it ( at work
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) because the spark plug inserts spin. I tried searching PS1, PJ1, PR1..... whatever the heck it is I need to find out what I need to do to secure the inserts, and get the parts to reassemble it prior to the teardown. I realize that some of these spin and there's nothing to do about it, but I want to inspect it regardless. Also, have plenty more pics of the blaster if you're interested.
Thanks,
Dylan
 
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