The sledge hammer is out there cause my kid was smashing open rocks while I was working on the mats. I went with S-R-R-R-S, hoping that will help with some of the slower streams I plan to visit. I even got creative with the last piece of razorback and glued on some small rubber rounded strips from a window screen to try and create my own little nugget traps, figured down at the end it couldn't hurt to change it up.