If you have some rust the plastic doesn't want to go in the hole. I used a dremel to clean it and the plastic still gave up without any lube, a c-clamp and a small flat head screwdriver. There's a reason this comes with two packs of lube. Use it. Inserting a steel pipe through plastic is another problem. Here, too, there is an easy and a difficult way with the C-clamp. If the steel tube is pushing out the plastic at the opposite end, then you're on the wrong track. Also make sure both sides are locked with a 2x4 if using a C clip. Straightness is also of great importance in this operation. Keep order. After all, it's pretty cute. Yes, it's a hard polygon, but the track doesn't affect the car much, so there's not much in the hard driving category. I made a video and it doesn't move at all. All looseness in the ride disappeared.