Protect Your Ball Chain Keyholders!

A 100-yen shop item I've been using for about 3 years (ΦωΦ)ﾆｬｰ Have you ever had your ball chain keyholder's main body go missing because the clasp was weak and it came undone? This product prevents that from happening! (^^) Image ① is something I bought at CanDo about 3 years ago (maybe even longer). Image ② shows how I'm using it. Depending on how you handle it, it can break... But the one I have attached to my ball chain right now has been on for over a year. To use it, thread the ball chain through the product, attach the clasp, and bring the product over to the clasp area. Adjust it so the clasp is in the middle of this product. It can slip, so you need to check it occasionally, but ever since I started using this product, the clasp has stopped coming undone. Besides CanDo (Image ③), similar products seem to be available at Daiso (Image ④) and Seria (Image ⑤). Images ①, ②, and ③ are made of silicone. I'm not sure about its durability if the ball chain keyholder is dangling outside a bag. Sorry. Use it as a backup! (^^)