I just purchased this engine which has some great detail and the Chug - Chug from the tender is really cool. However, the wheels don't want to turn very well. Sooo, I opened her up. Motor works very well, along with the light & looks to be an element for smoke. Great running gear, very realistic. But here is the issue, the wheels have separated from the center shaft on all wheels. I figure to glue them back but I have no clue to the rotation timing of the drive assembly for each side. I've looked at some models on Ebay that have photos of each side. Kinda looks like one side is a little more advanced the the other. Others look like each side is exactly opposite from the other. Since I plan to use a strong glue, I figure I have one shot at getting this right.