Oh, got it. Yeah I agree, don't mess with the damper's weight (much). Thinking of the calculations: IF the pulley is part of the mass spring mass system that is a harmonic balancer then this precludes lightening the pulley for other purposes. That said cutting some small grooves would probably be close enough to still get most of the damping effects. The newer TDIs have dual mass flywheels. Mine was converted to SMF (I think it is ~4lb lighter) at some point. That combined with motor mount bushings leads to some vibes but I'm not worried/bothered.
My wife's 2015 Impreza inadvertantly got an overdrive AC compressor pulley: The AC clutch failed at 65k and they wanted $1400 to change the whole compressor and recharge the system. The '15 pulley/clutch was not available yet so I bought the one for the previous year. It fit the shaft but was smaller. AC is cold
