Generator output setting

I installed a diode in the cutout today. I’d like to lower the generator output, which is currently close to 10 amps, down to 5 amps. Looking front to rear at the generator which way do I rotate the third brush (with the engine running at about 20 m.p.h.) ?

Tom I think moving it counterclockwise lowers output, clockwise raises it. Langs sells a special wrench for this, or you can make one:

Thanks for the come back. CCW did it. I got the output down to 5-6 amps. For the wrench I used a 5/16" box end ignition wrench from a Craftsman set I’ve had for years. It worked very well. Tom in Taylor Mill, KY 41015