Snow day here in WI as we are getting pounded so I finally got some shop time. Here is a short little video on a rattle chamber I made (my first) using a tutorial from another site with some fun and effective modifications.
My process was very similar to the tutorial, I took one of my Musky Spook blanks and drilled a shallow 5/8" hole with forstner bit on both sides of the plug. I then drilled a 1/2" channel through plug. Next, I drank a Pabst and then cut two 5/8" discs from the can to seal the ends. I also lined the 1/2" channel with Pabst aluminum as well. I used epoxy to seal the end disc and then when dry added a 5/16' steel bearing. I then epoxied the other end cap and filled in hole with plumbers putty. I sanded the putty when dry and I was pleasantly surprised with how loud the rattle is. The plumbers putty definitely added to the decibels.