I recently did option B to my p-68AT. It worked awesome. It is now shooting a very consistent 281 regardless of the temperature. It was crazy cheap to. Under $15 for the siphon and the nylon washers to shim the trimmed main spring. Also because the main spring has to be trimmed with this option, you get a smoother pump stroke.
Last edited by Myrkul; 01-29-2012 at 02:15 AM.