I am curious where you can find this 1.2mm drill bit??????????
As stated in the Pit Pass Hop Up article.
"Drill all four holes in each shock piston with a 1.2mm (#56 or 3/64") drill bit before assembling the shock shafts. Always use proper safety gear with operating power tools. When assembling the shock shafts, pay special attention not to overtighten the valves on the piston"
While were at it, will the GTR springs work with the stock shocks?