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Re: Metal ball bearing in Airbox?[200/82] posted by abe crombie on
Sunday, 10 January 1999, at 1:49 p.m.
A 3/16" ball bearing is used to seal the CO adjustment screw port in order to make the car compliant with mixture adjustment anti-tamper laws (the ones that got idle mixture screws covered on 81 and later cars).
I bet that it was driven down into housing, which is the typical way to do it, in order for someone to adjust the CO at some point.