Thanks for the photo. That makes sense.
I got another question and a photo to go with it but I don't know how to add the photo.
On the spear, once you remove the retaining spring, there is a black hard rubber stopper thing at the end of the spear shaft. This black rubber stopper holds the ball valve and spring inside the spear. I was able to remove this very easy but have a tough time installing back. The black stopper is about a 1/2 inch long.
Any suggestions on how to install this?

