With the recent nerf of the Turntable, we have been left yet again without a compact and reliable way to measure long swaths of time. Enter the "dispenser clock":
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Since I have had trouble installing BTW, I have to demonstrate the principle using pressure plates. But I am certain that Detector Blocks would make the system even more compact, and make arrow-clocks possible.
I just wanted to draw attention to this neat little trick, in case some people didn't know about it.