Thanks you all for the nice comments!!
Hi Hairy, I think it all about the size and harness of the noise makers. I tried little BB's but they don't make enough noise. The 1/4" balls hitting the wood are just right!! They are set it a 3/4" round pocket. I did that with a ball nose router bit on each half. I cut apart old ball bearings and take out the balls and clean them up for things just like this.
Cheers, Jim ........................ Variety is the spice of life...............Learn something new every day