The hole in the sheetmetal that holds the key mechanism in my John Deere LT133 riding mower was pretty loose and gappy. Sometimes the entire mechanism would pop out a little and didn't feel good when turning it. This 5 minute print eats up the slop. Simply superglue it to the inside of the sheetmetal to hold it in place. When the key mechanism is installed, it will push it against the sheet metal so you're not relying on the glue.
The author marked this model as their own original creation.