Has anyone had any experience with a tonegard. It's a metal frame that is used on the back of a mandolin to keep it from touching your belly. I have ordered one called a celtic knot. I will write a review after I use it on my Benjamin. I tried a sun shaped model at Adona Ar. Bluegrass pickers reunion, and first impression was, I have to have one. $95.00 for the celtic knot, but I think it's considered a custom order. Others were a bit less expensive.