I would concur with the positive states regarding the current owners of SK Grimes. They do indeed do first rate modifications and installations. However, please be aware that, IMO, they are expensive for the work that they perform. If you can get another estimate then I recommend doing so in order to compare prices. Realize that Mr. Ritter also does LF modification and repair work, and a number of other individuals can do shutter repairs. Best of luck to you.