Review on Wood Trick Mechanical Assembly Constructor Puzzles ~ Brain Teasers by Robert Sorrells

The truck uses friction pins to hold it together. Pens are made from toothpick pieces. That's all good except the included toothpicks are too thick. Each toothpick had to be carefully sanded to fit. You had to be careful not to grind too much or the pegs would be too loose. I have emailed Wood Trick about this but have not received a reply. The kit includes a small piece of 1.5" x 2.5" sandpaper with 220 grit. Toothpicks quickly smoothed it out. I switched to the 150 grit sandpaper I had on hand and the sanding went much faster. The wax that came with it looked like a ¼ inch piece from a 1 inch candle. It soon fell apart into several parts. The instructions state that you must ream all gear teeth, but it is not clear that you must also ream all surfaces that slide against each other. I think that's why my truck isn't moving. I highly recommend watching the assembly video on YouTube. It explains most of the printed instructions and often shows a simpler/easier assembly method. Don't expect the kit to be as easy to assemble as shown in the video.