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Originally Posted by stevebfl
The item #47 is a small ball bearing. It is called an antitamper plug. Once driven into the top of the tower it ain't coming out. It serves no usefull purpose other than to keep DIYers out of what they shouldn't be messin with. The car performs just fine without it.
Look at this picture and see if #11 isn't what you want.
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Thanks for the quick reply.
I picked up the #11 last Friday and replaced it because the one which appears original to the car was cracked and brittle. It actually fits in the center opening of the top of the air cleaner housing, apparently so a seal is maintained between the top and bottom of the air cleaner housing when it's all screwed together and air can flow from above the air cleaner down toward the top of the tower, while air inside the air cleaner cannot.
So, I guess I don't need to screw with "the anti tamper plug" and can leave well enough alone for now. How does one tell if this mixture control tower/valve starts to screw up and needs maintenance/replacement?
Chuck