The Schaller BM tuner had a 14 mm post; slightly wider than the similar-looking 60s Kluson tuners and roughly the same as the 1973/74 open gear tuners (also probably Kluson). The post hole is 17mm. The seventies Gibson logo appears on base plate of each tuner, with
One major advantage of the Schaller BM over the earlier Kluson models is the flat baseplate; there is no need for any additional headstock routing to accommodate the raised sections on the underside. This tuner disassembles into more pieces than the earlier keys, but this is another great advantage. This key can be re-assembled as either left or right handed. The same set will work for a two-by-two or four-in-a-row headstock.
Some basses fitted with these tuners
List of Gibson bass guitar tuners
Gibson bass tuning keys for sale
1980'S SCHALLER ROLLER BASS BRIDGE CHROME W / SCREWS GUILD KRAMER ARIA GIBSON
Berlin, New Hampshire, 035**, UNITED STATES OF AMERICA
$129
This is one of the all-time great bass bridge designs! It's massive yet low-profile and you can adjust string height as well as string spacing quite easily. The roller saddle design places a lot less strain on string windings and this adds to sustain. Made in Germany with the DBP patent # so you know it's an early one, Some minor oxidation but no rust or pitting and all the adjustment screws turn freely. Includes the (3) original mounting screws.
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