Correct ;
They just sit there in a casted in groove .
DON'T take them off because once in a while they're bugger all to get back into place
.
OBTW : you should not ' turn ' or ' machine ' the brake drums unless they're severely bell mouthed or so badly warped the brake pedal pulsates under your foot .
This is directly from my BENDIX (the good Folks who engineered the drum bakes on your old Chevy Truck) Factory training ! turning and machining brake drums reduces their ability to dissipate heat , always a very bad thing on drum brakes indeed .
Dealers & Shops like to insist upon it because it's easy money and sells lots of new drums .
Once in a while the Customer runs the brake shoes metal to metal , then what ? .
Simple : take some 600 grit sand paper and smooth up the sharp ridges then re assemble with your new shoes and do a gentle break in by making numerous slow (- 35 MPH) stops , in a few blocks the shoes will be fully bedded in , if you have the original automatic brake adjusters , just back up and make _complete_ quick stops a few times and they're done .
Other wise manually adjust the brakes until there's nu ' SH , SH ' sound coming from the shoes against the drums ~ this tiny bit of clearance is critical to prevent heat buildup as you drive .
Most ' mechanics ' (feh) adjust brake shoes to a light drag , this is wrong and dangerous to boot .
I hope this is helpful .