It is very likely they were pressed on. There would be an inner and an outer stem. If you tried to prying you would most likely damage some part. It looks like it's of an age where poured or pot metal was used in the manufacturing process, covered in a nickel chrome. I am sure you you would like to save the unit and reuse. How ever it might behoove you to upgrade and get something new, but have a classic look. If the latter is the case, then cut it off. This is my 2cents worth. I hope someone can answer your question who has first hand experience.