He was the builder of the one and only mechbox that has lasted practically my whole airsoft career, and that box is still going. His shim work is unsurpassed.
No offense to Gump, as he is truly a master, but I just have to say this..
It's a fucking mechbox, not a goddamn liquid fuel rocket engine.
The instructions to tear down every version are on the interweb, usually with pictures and sometimes even video.
LEARN TO FIX IT YOURSELF. IT AIN'T MAJIC JU JU.
You want custom call Gump. You want anything else, you can probably handle it.
And if you are still worried, rip a chicken in half and rub the blood all over your body and pray to whatever God you pray to.