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I some carpet debris in one of them and that cleared up its problem. For the other the first thing I suspected was the flags. I changed them out, Added alot of lead because I thought the cars were hopping over the return mechanism. But still at speed the LC snapped back to lane change. Drove me crazy. If you read my post on SF, it was finally with a small car that was magneted for max adhession I could see the mechanism bounce back after car past by. Anyway hope my repair is permanent and either I or if someone experiences the same
thing then they find a better way to fix it. I just wonder how many other people have this problem. I know these are only toys and I expect it happen once in awhile but it was doing it everytime.