Aosom 2-in-1 Small Dog Bike Trailer & Stroller, Blue

We purchased the "small" red 2 in 1 for our aging dog. Put it together for my mom and it was so easy. Pristine, clean, easy to assemble, take apart, change attachments, and moves like a breeze. The only problem is it was too big for our apartment. So we gave this one a shot because the brand seemed amazing from the quality of their "small" and the size was perfect, though I was wary of the wheel in front (and that is definitely a hazard but) and it's the exact opposite experience. Has to be an older model, I can see where they fixed these issues in the red one. The size is perfect, but there's metal shards on the inside around the fittings, nothing is cut cleanly, I struggled to put the wheel on and now I cant get it out, even without the pin, let alone switch that out for the bike attachment or fold it up. I have no idea how I'm going to return this thing. The top bar on the inside is nearly impossible to access and actually put together and keeps slipping out before you can put the pin in it, and no access to actually get to it easily. The only pros to this over the giant one is the size. The wheels move great but I legitimately cannot take this back apart. Please just make the "small" 2 in 1 with the 4 wheels in this size. The single front wheel is assembled correctly and it's at an angle it shouldn't be. I don't think this is a new item, and that 3rd wheel in the front is definitely something a dog can hurt themselves on easily, especially with it unstable because it is cut incorrectly or warped, not sure which. I don't want to put my dog in this because of the metal shavings, so I cant even properly try it out, but it's so back heavy and extremely easy to tip over compared to the larger one. It's not balanced at all and I imagine if a dog jumps toward the back the whole thing will fall over. Skip this, either buy another brand with a similar size, or buy the big one. The big one is built better, more stable, and it's parts are actually cut correctly. Don't know why this came dirty but I won't be putting my dog in anything that has shiny metal filings shedding from the hardware. I tried to clean it to give it a fair chance but it's still shedding. The "small" 2 in 1 is genuinely high quality and I was really impressed. And the design of this (minus the one front wheel instead of two) is not as nice. The inside carriage area and the screens are really nice, the size is perfect, but overall the build quality is so much worse. Genuinely have to ask support what to do here because I and others cannot get the parts out to put it back in the box. Not as important but the instructions could be better too. They were easy to follow because I put the other one together, but the 'instructions' for the front wheel is literally just a photo of it with the wheel on. Nothing about the pressure pin. I do like the push button for the back wheels, but if this brand would release this exact size with the "small 2 in 1" with the top bar access panels, the four wheels and the adjustable stroller handle, and all the improvements that go along with it- the exact same design and quality but in this small size, I'd buy it instantly.