Went to Creative Plastics yesterday and had them cut me some pieces of clear acrylic. Saw a diy on this, so thought I'd do something of the same but change it up a bit. I made it to slide on one of the center braces. When in use it sits at the front, but when I need to get in there I can slide it all the way to the back. The cylinder sits about a 1/4" inside the water to contain the pellets until they decide to fall.

