I hope you don't mind if I revive this "old" thread. I have an update on the Spectator Chair situation.
I have been looking for suitable spectator chairs in Japan for a long time but unfortunately, there are almost none to choose from, except for the ones from Diamond which I didn't like very much, I think this is because there are hardly any privately owned pool tables and pool halls usually have benches or just cheap chairs.
So I bought these great barber chairs, they are called "shampoo chairs" here because you can recline them to get your hair washed.
They can be rotated, the height can be adjusted (perfect height to see the pool table), super comfortable, can be reclined and the headrest can be adjusted. They also look pretty cool.
They also come with a footrest but I didn't attach it, maybe I do it in the future if I feel the need.
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