A follow up pic of the louvers with the media off, which btw latter very sturdy. Least favorite part of dissection is removing media since utility/exacto knife needed and requires several turns and much care taken. With louvers though, not a bad idea to show. No need for light down centertube here.
As for perhaps better Puro QC/QA now, don't want to predict. This anecdote a good one though, and hopefully others I have will be similar. But, "perhaps".
You're welcome Char and Zee.