Product review (5 stars): Perfect replacement
Took just several minutes to replace the old part.

I almost did not purchase the part because of the picture.  My machine did not have a threaded post and the picture showed threads.  My post was a ribbed non-threaded one that looked larger than the opening pictured.

Fear not.  If you have a brass post that is ribbed not threaded, the brass piece screws off revealing the threads needed for the new part.  You just need needle nose pliers to hold the inner ring and standard pliers to unscrew the brass post.