I'm currently drafting a wind tunnel model of a rocket. However, in my drafting file, part of the mount inside the body tube is hidden even though its visible in the assembly file. 

Can someone help me out ? 

Thank you

Edu ​​​​​​​3DEXPERIENCE ​​​​​​​CATIA ​​​​​​​Assembly Design ​​​​​​​Drafting ​​​​​​​