Plug-in coils remained the most popular means of changing bands for many years due to the simplicity. Yet many of us longed for the convenience of band-switching. My first attempt was a disaster. That set was junked-out for parts.
I decided to just try to build a receiver for 20 and 40 meters. Individual L/C circuits were made for each band. The small capacitors were adjusted so that the bottom end of each band fell on zero on the dial scale. The problem was maintaining accuracy with a calibration chart. As long as plus-or-minus a few kHz was acceptable, the set worked fine.