Just push the cyclic stick slightly forward
No you need a lot more than that for negative g.
You can get a slight reduction from purely forward cyclic but for negative you need a zoom climb followed by a bunt - ie lower the lever a bit as you push the cyclic forward.
Most engines and gearboxes can cope with that for short periods.
So as we probably all know, Chick talks a good fight but didn't invent the manoeuvres, teach himself them nor modify the aircraft in the ways he clamed.
Not saying he is a bad pilot just a self-promoter.