|Building Electric Guitars, Basses, and Amplifiers|
Guitar players are very fussy about their instruments, though, so they want it just-so.
The strings on a guitar are tight, so they pull hard! An ordinary machine designed with these stresses would use larger parts for durability. Since guitars place a premium on small size and low weight, the hardware and structure needs to be carefully optimized, else the guitar will either fall apart or become piano-like.
Perhaps these links will help you find strong yet small and lightweight parts: