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Originally Posted by russc  Curt, you might want to try drilling one of the holes out to be really, really big. Even the biggest valve hole is pretty damn small. Besides that, the only other thing I could think of is that your mainspring is worn out. |
I think that only matters if the upper transfer port is drilled out as well. Mine is slightly larger than 3/16" (maybe a metric size?). I believe that a valve port larger than that would be useless. It may also reduce the blow back flow.
David