Hey all, I finally got around to buying a trailer for all my stuff and got everything out of storage. I was working on my KP-115's and admiring the cheesy cardboard port tubes. The only thing holding them on is glue. I came up with a possible solution. At Parts Express I believe it's page 153 in the catalogue the have all of those port tubes and such. Why couldn't I use the 4 inch diameter ones and glue them to the cardboard? I'd use the longest ones they have. That should really stiffen them up. My only concern is, the catalogue says the diameter is 4 inches inside and the port measures 4 inches for the outside diameter. What do you all think? Thanx, Mark