1964 Dodge Dart - Wheel Stuck

the drum rides on the axle center hub as does the stock rim . lugs just secure it on location and drive the rim of course . but a wheel cylinder can be stuck and not returning which keep the shoes from leaving the drum . do back off the adjuster and smack it with a hammer to break it lose from the shoes . that is if the drum will not turn .
So, the center blue cap doesn't need to be touched, correct?