unless someone loosened the round plate and did not centre it properly before tightening up the bolt.clean thoroughly first and then grab the bolt head with a pair of pliers and pull upwards.it shouldn't stick should drop right back down to original place when you let go.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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