I have done some searching and found very little on where to get bar risers that give you 10mm of rise for our beloved 06 YZ 450F's. I tried the washer stack and that only gave me 6 mm before running out of threads to bolt the stock riser back on. Also, after a get-off I bent one of the handlebar risers. I read about the GYTR risers and how they can be height adjusted 5mm higher (how do they accomplish that-- a spacer?). They also move the bars 5mm forward. I could probably get used to that because if the bars get raised then they begin to move backward due to the angle tilt on the stock risers. I know other people have made the 10 mm up switch. Do you have to use higher bars as the only viable method?