No you can't push the red short pin through the grey piece, it's a 6538c [0,1] by the looks of it and those have a small wall in the middle to stop push through

No you can't push the red short pin through the grey piece, it's a 6538c [0,1] by the looks of it and those have a small wall in the middle to stop push through. They're meant to be used to connect two Technic axels and just sit on the two ends. [0] https://www.bricklink.com/v2/catalog/catalogitem.page?id=67471#T=C https://www.bricklink.com/v2/catalog/catalogitem.page?id=674... [1] https://img.bricklink.com/ItemImage/EXTN/17834.png https://img.bricklink.com/ItemImage/EXTN/17834.png