Struggling to attach this ti tip to the body

Havent touched this old titanium dynavap in a few years and am really struggling to attach the titanium tip to the body. With the four o rings and narrow body it’s seemingly impossible to attach properly. I dont remember it being this difficult, any help is greatly appreciated.

Havent touched this old titanium dynavap in a few years and am really struggling to attach the titanium tip to the body. With the four o rings and narrow body it’s seemingly impossible to attach properly. I dont remember it being this difficult, any help is greatly appreciated.