Bobbin tightening!

You know the trouble we all have with bobbin type shuttles.....the bobbins soon become slack with wear, so much so, that you can't use any pull on the shuttle without the bobbin unwinding? Well, I have found the perfect answer.
I had recently tried using bits of rubber bands, which was better than nothing, but not yet perfect.
I thought maybe a solution would be to fill the hole in the centre of the bobbin with a substance that would dry but also be flexible and decided to try the sort of silicone that is used for decoupage.
I bought some from my local craft store and gave it a try. IT WAS MAGICAL!!! The shuttle worked perfectly! I could put plenty of pressure on the bobbin without it unwinding but a little more pressure let me pull out as much thread as I needed.
I am chuffed to bits! LOL!!!