I just bought a '91 B7100 HST from a local dealer, so far I am pleased with the machine. I got a 4 foot rotary cutter (to use for some light duty cutting) and have a 4 foot box blade on order also. Unfortunately, when I bought the tractor I didn't notice that the previous owner for some reason welded the two pieces of the rear hub assembly together so now I cannot tighten the hub against the axle. New hub assemblies are quoted to me at $136.00 each. I live near Houston, Texas; does anyone know of a salvage yard that handles parts for this unit, preferably in my area?