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This looks like a cool device, but I am puzzled by the Instructions. I see that the "original" flavor uses three of each fastener. (Machine screw, washer, thin nut, and bearing). The "adjustable" version also claims to need three of each fastener - but don't we need a FOURTH nut and machine screw, the ones that provides the adjustability? Are those "fourth" machine screws the same length?

And what about the machine screws that clamp the main part to the optional base? (I see these in the photo of the yellow variant.)