I am trying to repair a Sierra Ceiling fan that I purchased over 10 years ago and I cannot source the "Sierra" Fan company for parts. I think it is a Sierra because that is the only name on the side of the fan. Other numbers are KT-7000, E89543, Ser No. 704087. Any help would be greatly appreciated. The part broken is a rubber disc that goes over the output shaft and holds the 5 blades in place.