When working close up I don’t have good 3-D vision. I’ve had a difficult time getting an appropriate screwdriver blade positioned correctly against the regulator lever to push it. One time, I went down into the balance wheel and I will only say it did not turn out well.
I ground a notch into the tip of this inexpensive 2 mm screwdriver blade. De-burred it afterwards, wiped and rinsed it and then wiped it again to hopefully eliminate all small bits of junk. It worked just as I hoped it would.
Gently rest the short part of the blade tip on the top surface of regulator lever. The longer side of the tip is the pusher.