Instant installation.. I think my Dean pick up had a spring material that you pushed into one side of sound hole.. Sort of like putting batteries in a remote control..
http://static.weloveshopping.com/shop/music-boulevard/extra/9786397.jpg
Note the black material on either side..
Now I wonder where it went.. Like Mike Olekshy, The guitar I had it in was over 20 years..
Have a great day and keep on pickin
