We are having a heck of a time replacing the tuners on my kids bass. Can't seem to locate replacements that have the same dimensions as the ones that are on the bass. This is a Made in Korea bass, likely a pretty early one because the Fender logo is regular size and the squire logo is miniscule. One tuner keeps slipping jumping. Would like to replace them all. They say licensed by Schaller on them. No numbers. Went to Stew Macs website but the dimensions don't match on any of the ones they sell. Anyone got an idea? Are these an oddball size? Thanks for you help!!!