To stick the fabric to the inside of the box, I chose Aleene's 2-Sided Adhesive Sheets. Since the inside shape of the box is a little tricky, I cut paper templates and cut the fabric to match the shapes, making sure I had at least 1/4" of fabric to turn under and create clean edges. The adhesive sheets are very thin and extremely sticky and are holding the fabric very nicely.
Here's a picture of the finished liner with the tuning hammer stored inside.
Yes, it's totally out of character for the instrument, but it's my little secret. With the lid in place, no one will know about it except me. Using old, yellowed music might have been a better idea, but I wanted something a little softer. Fabric made sense. Besides, I can always change it in a heartbeat!
I'm now on the hunt for a little knob to put in the center of the box's lid and did actually come close while digging through drawers of hardware odds and ends in an antique store located in Omaha's Old Market area. "Close" is the keyword. Looks like I'll be ordering something off the Internet. Stayed tuned.