Good evening and thank you for inquiring with JustAnswer, my name is XXXXX XXXXX i will be the technician assisting you today.
first i would suggest double checking the upper spring orientations, as well as the mating surface of the shoes to the pivot and compare then to the other side, they should all sit flush. Next, since the new shoes have new lining and assembled they will be wider than the old worn ones, make sure you back off and spin in the adjusters completely after replacing the shoes to compensate for the new lining. Once screwed back in, install the drum and with the palms of your hands, budge the drum back and forth on left and right sides to center the shoes and remove the drum, then adjust the adjuster about 3 clicks at a time and reinstall the drum, if there is no light drag on the drum, remove it and readjust another 3 clicks, reinstall the drum and recheck the drag, repeat as nessecary untill you reach a light drag, then back the adjuster off 1 click.
I hope my assistance helped you and resolved your concern, if you need further assistance please ask.
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A) is the adjuster spun in all the way to compensate for the new lining?
B) Also, are you sure that the new shoe is same size, holding the old shoe against the new shoe resulting in same dimensions?
Also double check to make sure the shoe didn't slip past the 'land' on the backing plate causing it to recede down a little in the ridge of the backing plate.
If possible, please upload an image of the brake assembly for me to review