I attached my stl. file of the model, but here's how to make it
First, download 123d Design Desktop version here http://www.123dapp.com/design , start a new project, and change your units to inches
Then, create a sphere with a radius of 0.5 of an inch
Next, put a circle on the sphere with a radius of 0.17 of an inch
Extrude the circle in 0.5 of an inch to make a hole in the sphere, and delete the remaining circle
Next, combine the objects into one object
Select the mallet then press Ctrl+c then Ctrl+v to copy and paste it. Move the other mallet over that has now been pasted right on the first mallet.
Change the material of the mallets to glossy plastic, and you're done!
If anyone is interested in an stl file for chimes/tubular bell mallets, just let me know and I'll upload it to this instructable
Be sure to check out some other awesome stuff that you can make on 123d Design at https://www.instructables.com/contest/123ddesignchallenge/ and the 123d group on Instructables