There are many magic props that are a pain to use. Mostly because of either they wear our or need to be maintained. For example, you may have a prop that has a flimsy hinge or a string that rubs against something. Those are things that you need to keep an eye on.
On thing that I use in my show is a remote control to run my audio. I’ve heard stories of people breaking the belt clip on it. While not a huge deal, it’s a pain the butt to not have one while you are waiting for a replacement to arrive, or trying to figure out how to make a makeshift belt clip.
I was working on another prop and had some leftover silicone, so I made a mold of the remote control’s belt clip and made a couple belt clips.
These fit perfectly onto the remote control. The are going to live in the bottom of my audio case for when I need them, or am working with with someone cool who might need one.