My friend recently purchased an Echo SRM-211 from a garage sale. Everything runs fine on it. The only problem seems that the drive shaft was run over by a lawn tractor or something similar. This bent the shaft (its a straight shaft trimmer) and when he got it home, he literally put it in between two trees and bent it back. The thing runs fine with no problems, he went and used it with no flaw what so ever. However, should he be concerned that it was bent and then fixed? Could there be problems in the future? Thanks