Thanks for that, I have some of the locking ones... and didn't know about the posts breaking.
I had one trade in park where I got a cool hidden mickey pin I really wanted (Ezma Bowling pin), put the rubber mickey on the back... and 15minutes later went to check it... only to find it had fallen off.... Ohhh well.
I will say the ones that uses the Allen wrench to tighten. Be careful as I ised those because I had my haunted mansion and a few star wars pins on my backpack straps and I lost one of my star wars Halloween pins. So someone in the park got a nice treat and trick on me lol. Just make sure to secure them good.
Thanks for the info. I use the ones with the screw and I appreciate the heads up on denting the pin. I have also had an issue with having no screw in them when I purchased them. I returned them to a shop in disney where I bought them and they gave me a brand new pack with no receipt!!!