I was very excited for this product for my son. As I began to assemble it I made sure to take out each part and very I had everything and followed the instructions to a T. At one point it tells you to very the lugs are turned the correct way so the screw will go in properly. As I out each part to one another I verified. However, as I began putting the screw in the lug but would turn into the wood and split the wood. It did this to me 3 times. The lug nut just turns down into the word. I was able to get the product together and put some super glue where the glue split to make sure it holds. My son loves it though and has had so much fun with it!