a pulley mounted steel with aluminum hub would be more than enough see sheet metal stamped without machining, it is recommended not to clean titanium with trichlorethylene because it creates a surface that can corrosion creates primers cracks in the duration of time, the Pinion of bevelbox 32 steel tooth do not wear, so with 66 tooth should be everlasting, mounting the steel pulley should be like for pulley plastic.
http://www.supermax.net/Pages/home.asp
