To prevent a guitar’s or bass’ finish from cracking or chipping when you drill a hole in it, place a piece of masking tape over the spot where the hole will be drilled. Use a very small bit to make an initial guide hole, then expand the hole to the desired size using larger bits.
WARNING: Be careful! Any damage caused by modifying your instrument will not be covered under the warranty. Be sure you know what you’re doing before you make any permanent changes to your guitar or bass! We ain’t responsible….