I am current a member of a handgun club but my membership will be expired at the end of the month. I am planing not to renew my membership there because of the high membership fee and I am planning to change to another club. But the staff of the old club says that if I do so they will cancel my ATT. So my question is how can I change my ATT to be based on another club? Do I need to fill out any form? Or I can just need to make a call to change it? Or I have to ask my new club to do it? I have no idea. Please advise. Thanks.