Question - Can I replace the silicone washer in the BBS01 axle assembly with a like sized nylon washer?
Background - I am rebuilding a Bafang BBSHD BBS01 mid drive e-bike motor assembly. I have about 10K miles on the motor and began experiencing some noise. The fault appears to have been corrosion on the mechanical bearing at the top end of the rotor. Cleaned, greased and attached with lock tight. It should hopefully work. While checking the axle for damage, I discovered the sole silicone washer (27mm OD x 18mm ID x 1mm Thick) was slightly damaged [see photos]. I have been unable to find a suitable replacement. I can find a like-sized nilon washer. Can I swap or does the silicone washer impart some special characteristic for this application? My gut says the nilon washer will last longer.