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Sorry, no, I have sold it several weeks ago.

My reference to the article was only to suggest that running a 4" hose / duct from an extractor through a cyclone, and "then" moving into 6", would reduce airspeed. In theory (and in practice) it would be better to maintain the 6" diameter through the cyclone and into the extractor itself...

Have a read of this here. It explains things clearly. https://www.woodmagazine.com/figure-dust-collection-needs-by-the-numbers

I think your problem of chips being left in pipe / duct is due to the fact that you have an extractor / cyclone that has a 4" port, but that it's connected to 6" ducting. As soon as the 4" moves into the 6", it's going to lose a massive amount of airflow.. you may be better using 4" ducting...

I have a Startrite 401s I am selling, but I'm in South Wales unfortunately. In fact, I'm brand new here and only joined as I was searching for an idea as to what to ask for it and found a link to someone selling one on this site, but that was from an old thread. Sorry, not exactly any good for...