New member with WRRS mini bell qurstions

[Mafarnz]

Hi there. For the most part, I am mainly interested in train horns and locomotive bells, though I do have two crossing bells.

http://www.youtube.com/watch?v=SndtzvkvIqI

I had a few questions about my mini bell. When I got it, the contacts were bent so that only one of the two connected. I straightened and adjusted the contacts, the result is what you hear in the video. Now, I'm not too impressed with how it sounds right now and I'm wondering what I can do to improve it. I have a few pictures to help out with the description.
First off, the contacts look to be pitted. Do these need replaced/repaired?
Secondly, is the bell missing a hammer? I took the rain guard and gong off one day and noticed that it looks like it's missing a part or two.
Also, I have included a photo of the diagram that is inside the cover. It's odiously a 1276 bell, it has 1276 cast into the back of it, but the inside digram says 1275. Any differences between the 1276 and 1275?

[Mafarnz]

It's aluminum. Ok, I'll leave the contacts alone then. Now, where can I find that missing hammer part?

[Mafarnz]

Thanks! Would you mind posting a picture of the hammer so I know what I am going for here?

[Mafarnz]

Awesome, thanks for the help!