Also in this photo is my trusty stainless steel block. Not just any block, it has been water cut into it's basic shape. The groove on the end looks like someone wanted to see if a very tight corner could be cut using the water jet. I dunno. I do know that it makes a great weight when needed, and is cool to think that only water was used to cut it.
Here's the collector installed on the sculpture. Note the added piece at the bottom. This was for weight, but will also be used as the stop when it tips down release the 3 marbles on the track below.