I have a 200 hp Mercury EFI. I noticed that the prop seemed to be rubbing on something as I spun the prop. I removed the prop to find a steel tube appx 3" long jammed in the foot of the motor. There were also 2 small chunks of aluminum and a washer in there behind it. I took it to my local shop and he thinks that its a motor mount. Is it possible for a motor mount to fall all the way through from the top to get in behind the prop? I thought the lower unit was sealed? Just looking for other opinions as its not going to be cheap to have the power head pulled to check the motor mounts.