On any newer car, when you drop a screw or any small object,,, the chance of it hitting the floor is about 1 in 10. Can't tell you how many times this has happened to me or the other guys in the shop.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K