If the felt trap gives you worries there are bulk loaders with no felt trap. My Watson has a rotating gate that securely snaps open and closed when you need to put a new cassette in. There is an outer door that opens while the inner door is closed, and vice versa. The whole device is hard plastic you can throw in the sink for a wash, but I've never needed to clean it. The film would really only scratch if you wound it without opening the gate, but the device is so simple I can't see anyone making that mistake.