I'll start off with mine. I have a Thule Playpen (840). Thule had at least two variations of the Playpen. The first one, which I have, is grey with a tectured finish, circa 2002. The second variation was grey but with a smooth finish. The second veriation had the large boxy mounting brackets which they called the "New Clamping System". This was composed of a plastic box, plastic lockable cover and a metal flat plate that went diagnally accross under the rook rack. I do not happen to remember the specifics but I had to discard the mounting brackets off the first version and go with thebrackets from the second. Also the carridge bolts provided were not long enough so I purchased new longer carriage bolts from the local hadware store. And since nobody sells metric carriage bolts in the U.S. I had to buy new wing nuts for the SAE threads. The wing nuts size is limited do to the space in the mounting box and the cover that snaps on over the top.
Review, the Palypen with the modified mounting brackets from the second variation of the playpen worked ok. The mouting brackets where wide but flat. The lower bracket is metal but the upper bracket (case) is plastic, which makes it difficult to lock it down tight without over stressing the plastic case. I also know that this mounting can shift if the basket is impacted with another object. Example; one of the side "Outriggers" snagging a tree.
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