Reverb on Damper spring?

[tjcombs]

On the back of my Damper release bar there's a spring. I assume this is normal. When I press down on the damper pedal, and play a few notes, I can hear a sort of reverb. If I strike notes, then dampen the tines with my fingers it's still there. I've established that it's the spring that's making the reverb and the pickups are picking it up a bit. Is there anything I can do to stop this? I don't really like the sound of it. Do you think I could try putting a peice of felt down the center of the spring to make it stop?
Thanks
TJ