That bass popper looks great and I agree that the rubber legs can be a big plus.
Here is the tool I use in my Dremel to carve the front. http://www.homedepot.com/p/Dremel-Hi...r#.UfMJZ23y1ZM
I like a deep pocket so it makes a good popping sounds. Here is one I made using a feather and you can see the front.
Tied feather-head popper 7-8-12 007.JPG