Well, I decided to get a new expansion tank, as mine was the original. And, I've got the plug kit to plug the sensor hole. Now I'm having trouble getting the plug with the o-ring down far enough to add the c-clip. I found the thread on this, but it only talks about getting the c-clip into place, not the plug and o-ring down far enough to add the clip. Any suggestions? Thanks!

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1984 300D, 228k, Light Ivory, Java MB-Tex