The orange pin is hollow, but the red axle is behind it is not. That gray axle sleeve has a stop about halfway through so you can't push an axle all the way th

The orange pin is hollow, but the red axle is behind it is not. That gray axle sleeve has a stop about halfway through so you can't push an axle all the way through. It's meant to join two axles. You could omit the green sleeve as it is completely smooth on the inside. That will give you better access to the dark gray axle, but the sleeve is probably there to provide structural support to the frame. They might do a small update where they replace the "4 axle with stop" with a "5 axle with stop" and put a bushing on the outside to provide support between the stop and the frame. Provided, of course, that there's a brick's width of room where that assembly goes. Edit: I just looked up the instructions for 75313 and found the section with the assembly. The assembly is the "hip" joint, where the leg connects with the main body. The assembly is connected so that the offending axles are parallel to the ground. The dark gray axle points inward and it looks like, at least on the front legs, it's too close to another frame to extend the pin so that it sits outside the frame. https://www.lego.com/cdn/product-assets/product.bi.core.pdf/6393612.pdf https://www.lego.com/cdn/product-assets/product.bi.core.pdf/...