To go with the tutorial on making a spring I thought I would add the rest of the pictures I took while inletting a banana Patchbox.
I'll come back and add some pics of getting the curve to the box.
Once you have the lid curve right and the curve matches the stock. Screw the box down where you want it. I use a #11 exacto blade to trace around the lid.
Inlet the part that attaches to the stock first.
Once you have the forward part inlet you can inlet the rear portion.
Using a Forstner bit of the appropriate size you can take out big chunks of wood. Be careful to drill straight down and keep a even space on either side.
Clean the sides up and scrape the bottom smooth and you are finished.