Foam in si-cores

[weelance 0]

I've just purchased 3 sawn off si-core shafts and am really happy with them,

but what the smeg is that little bit of foam in there for...!?

Anybody know what i'm on about?

Cheers

[kovalchuk71 212]

dampens vibration ;) , and keeps stuff from coming off the tennon and bouncing around in your shaft