Decoband Grip Play

[Uncial]

I have a red ripple effect decoband and the lower grip section is all black but has a little bit of play in it which I can oftentimes feel as I write with it. It isn't so loose that it comes out, I just think it has either shrunk or loosened with age, but it really is very slight. I was thinking that a small bit of shellac might help to secure it, but I'm also conscious that this may present a bit of a pain if I ever need to replace the sac. Would this be a good solution, or is there another solution that might help that I haven;t thought of?