Why do you have to tighten screw for??
OH that's right it starts flopping from side to side.
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For me, the swivel function on my brush is really useful and I wouldn't want to be without it.
In reply to the above comment - if it didn't move freely from side to side, it wouldn't be a lot of good. Moving freely is key to controlling the swivel. Some of us like a little more tension in the swivel than others and that's one of the functions of the screw along with taking up the slack from wear and tear. However, on that score, I've used mine for several years and only had to tighten it slightly about half a dozen times. I don't consider this an issue considering the amount of use it gets.
Got to say though, that I have made parts that I use myself that I feel are better than production versions and I'm sure I'm not alone.