These work best when exposed to UV(blacklight). Search for UV(blacklight) flashlight on ebay. You can usually find them in the $5-10 range. You will get almost instant charging and extended glow time compared to regular light.
This is for experienced guitar/bass builders only!! NOT RESPONSIBE IF YOU DAMAGE YOUR GUITAR. You can drill out you old side dots and super glue these in place. Then use a straight blade to cut flush.