KWA M4 cqb

So I was on KWA usa forum trying to find out why the semi auto function of there new generation gearbox's, which I have in my KWA KM4 cqb, was not working properly. On occasion it would half cock itself not due to the way you pull the trigger. I figured out it was a bad cut off lever, from one of the KWA staff members. He said it was accidently installed in the factory in their new gearbox. Therefore, down the road I plan on replacing this component, and I was wondering If someone who has experience with this component could help me find a guide.

I contacted KWA and they will be shipping me the new disconnector lever. They admitted to their mistake, and I would rather fix it myself then have to pay the shipping.