Custom Key Work on a King Super 20
Adjustment screws custom installed on a King Super 20
One of the advances in saxophones keys has been the inclusion of adjuster screws on the Ab/ Bis Bb arm on the lower stack. Prior to that, it was all done with carefully sanded cork. Trouble is, saxophone bodys flex, keys get bent, corks fall off, and generally fall out of adjustment. Here is an example of a remedy, we installed 2 screws on a King Super 20 tenor to adjust the mechanism. 
Installing Bis and Ab Adjuster Screws
Inhorn Band Instrument Repair 