Review on Secure Your Pins With EuTengHao 30 Piece Gold Locking Pin Backs - 9Mmx5.5Mm Keepers by Curtis Sherman

I used these thinking I was going to "lock" my pins on my backpack. To be fair, I do use this pack a lot, and sling it around quite a bit. I thought the mechanism of these pin backs would be strong enough to hold my pins on my pack.Well, I did lose 1 limited edition pin that I was quite sad about--I ended up replacing that particular pin, so make of that what you will.I just noticed another pin on my pack had a lot of play in it; it was spinning around. I check the inside of my pack, and sure enough the "locking" pin back had come off. The screw was still in the pin back, and screwed down all the way. So I'm not sure what I am doing wrong, besides using my backpack a bit too heavily? I am slightly disappointed in the efficacy of the product. I will keep a close eye on the rest of my pins, and I suggest you do the same if you decide to buy these. *ALSO: be very careful when you are tightening the screw with the Alen key--the pin shaft CAN get warped caused by the tension from the screw, and it may possibly break. So again, use with caution.*