get yourself a soda bottle empty it less then 1/2 way .. pour the soda you pour'd out into the tube so as the stuck primer is covered w/ the soda
let it sit over-nite then give it a try.. wear glass ab gloves let us know how ya make out..
Edit:> Oooopssss, in case ya didn't figger it out already .. stick the primer tube in the soda bottle [ coke or pepsi works ]