How do I close the gap between upper and lower part of Sheaffer mechanical pencil?

[dennis.baker]

Please see in the attached picture that there is a gap between the upper and lower part of the mechanical pencil. I placed a toothpick at the location. I tried pushing hard to close the gap but that does not work. Suggestions needed.

[Wile E Coyote]

Push harder....

[dennis.baker]

I pushed very hard on it and I am afraid I will damage it.

[dennis.baker]

The fix can be seen at http://leadheadpencils.blogspot.com/...dle-joint.html

The problem is caused by the plastic shrinking leaving brass exposed that has to be removed.