Replaced drum seal. Wish I had gotten both the front and back as the front was where I had noticed the problem but the rear seal is not far from failing also. Watched the video. Looked easier than it actually was. Drum kept slipping off of the back ledge and the front ledge was impossible to put in place without a helper because of the tension from the drum belt. All in all job took just over an hour to completion from start time counting the time for the cement to dry.