myv65: Exactly. The block will want to spin. That force will be retained even though the block will be held stationary by the bolt tackle. Since the block can't spin and the force is being exerted by the water flow, the water will then spin.
For every force there is an equal and opposite force.
My prediction is that because of the volume/mass of the water in the bucket, the swirling will be unnoticable until it is at least halfway empty (I'm praying for a little dimple like what you see when you drain the sink). In the end, though, if the water was to even spin 1/2-1 revolution in the block, the block would be a success. The whole idea is to eliminate slow spots. But, as you said we will see (I'll feel like a boob if this doesn't work ... plus, in any event, the detail guys are going to be pissed that I'm going to be chopping one of their new buckets ... hehe).
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