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If you did the drinking with one hand signal with my crew, everybody would head for the trucks for a tea break.

So you have a hand signal for: " Add another 300 kg lift". I'm impressed.

Even with good visibility SENAs are way better than hand signals. I remember Richard, my partner, asking a crane operator how much lift he had on a Linden branch, then telling him to put 300 kgs more on it. When he cut it, it just hung there, going neither up or down. Try doing that with hand...