Ty Bertsmibile1. I can't find this unit available anywhere but do find a few parts. That is why I'm looking for a used one. This has been a good mower but perhaps time for a new (to me) one. Started out making a clicking sound that progressed. About 10 minutes it was louder and started to chatter. Depressing pedal lessened the noise and chatter considerably but did not eliminate it. I thought drive belt was going bad but that checked out okay. I guess there is a reason most shops won't repair these things, cost and failure probably. At my age (83) I'm reluctant to by new but may be my only option. I mow about two acres.