I used to keep a can of compressed air by my TT for quick touch ups but I realized it was an expensive habit, so I bought
one of these and recommend them, but be careful to lock your tonearm in placed or it can go flying! These things aren't like little air puffer balls you squeeze; they shoot a blast strong enough to even lift a record off the platter if one perversely wanted to!
Where does it say he bought any 'later ones'?
He could have read reports of 'later ones' sucking. Credible reports.
Like this. Buy a 'later one' and tell us about how it sucks. We'll believe you.
You are correct, they have been evaluated and are totally useless, and may be even harmful. The Cecil Watts Dust Bug is seemingly simple, but the research and design of it very complex. It took Cecil Watts many hours of research to get the strength and shape of the bristles optimal and also the brush.
I was a teenager when he published his research, and I'm nearly eighty now. But I was fascinated by his research and dedication. It is entirely due to him that my record collection is in such good condition, along with careful handling, especially keeping greasy, sweaty fingers of the playing surface.
I do have the odd spare, and let one of our members Squishman have one, as he was amazed at how good my discs sounded. He has been very impressed with his Dust Bug and uses it with every play.