That’s what I’m saying, have you priced one from the dealer? It might be the same as buying some tires or an exhaust but it is your brakes after all. I’m a mechanic by trade and 17 years specifically in the brake industry (which is where my handle comes from) and my instinct would be pull it apart and put it back together but I don’t know your level of competency to suggest you do it. You may have just misaligned something but you may have strained the thread which is causing the drag. The instructions for pulling it apart may well be on the Mazda tech gateway site but I’m not home for a couple of weeks so I can’t access it. Put it this way, faced with the same situation, my view would be, either pull it apart and investigate or buy new but keep in mind, there will be a surcharge for the old one so it will have to look presentable if you do give in to buying a new one. Of course you can get one from a salvage yard but they are handed and they were modified to reduce the risk of brake drag. I run the U.K. Facebook site (I’m Don) and I think I’ve got the TSB telling you how to make sure the one you get is post modification. I’ll see if I can find a link or just join up and there is an extensive files section in there.