I had to use a flat punch & hammer on mine. Crude tools, but it did the job. Now, if I would only quit Limp Wristing, so I don't get that dang Stove Piping!!
By-The-Way, if your serial number starts with 330- there's a RECALL on it!! If so, go to their website to sign up for a free shipping box. When it's returned to you, they are including a free Clip, so that's not so bad.