Review on 🎢 ROKR Mechanical Puzzles Waterwheel Coaster: The Ultimate DIY Puzzle Challenge! by Brian Sitton

My 5-year-old grandson and I put the marble walk together. I gave directions as instructed, he stamped and fitted the pieces together, I made sure the pieces lined up properly, and I created extra muscle for tighter joints. It took us about 6 hours for 4 sessions. We had a lot of fun and he is very happy with the finished product. Intelligent and thoughtful design. It's very nice to have clean laser cut parts. Suggestions if you plan to build this. The hobby knife is useful for separating some parts. We needed some medium cyanoacrylate glue to keep the "escalator" section from falling apart (some of the joints weren't tight enough to hold it together). I also needed CA glue to hold the top of the spool in place (seems like there should be a slot in the top of the spool mount, but there isn't). Turning the handle can loosen the nuts; A light screw lock solves this problem.