nathan
you got it right from what I remember and that was way back for me (about 5 months) just as a point of info I soaked the pre chambers overnight with a good penetrating oil . I still couldn't get one out because of stripped threads. I finally used a large tap , screwed it in and kept turning with a socket on the end of the tap. more oil of course but it popped out after a bit. when I installed the new one I put never seize on them. but at 330k I don't think they will be out again

good luck

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Ricali

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
49 Studebaker Champion
90BMW convert.167,000
60 Dodge D-100