Deuce, The only mod that I did was simply cutting a small notch out of the venturi o-ring. I'm going to be replacing it eventually with a Viton o-ring from mcmaster. TRMIV and others have used this one and is a direct replacement.
I think most of these guys that are purchasing these RPS skimmers are tinkerers in general. They work fine out of the box, but we all like to pull the Tim Taylor tool-time more power thing. Deuce, I know you are that type, due to the CSS thread, so don't be suprised if you don't start looking at the RPS as a canvas, if you will.
I'm completely content w/ mine, but I will surely check out the eheim needlewheel pump as a possible retrofit, just because I like to screw with things.
And as for Rich's comments about paying more for a skimmer thats not as effective....
How do you know it's not as effective? I don't believe well known manufacturers tank ratings, I'm certainly not going to believe what the little man in China is saying. That said, I'm sure the 8" skimmer does it's job. I wanted a external skimmer. I wanted more control. I wanted to be able to concentrate my organics. The RPS was the logical solution.
But don't take this the wrong way guys, I'm not trying to discourage anyone from the non-recircs at all. If you've got what it takes (Time, Metric conversion plans, Tools) Then save yourself some cash and go for it, let us know how it goes. You may convince me to buy another one!
Deuce, if you need any pics, or measurements, let me know.
Daniel