A straightforward roller swap means pulling the old rollers, checking the track for wear grooves or bends, and setting new rollers with the stem seated fully in the bracket. On a door this age, we also check the hinges the rollers ride in, since a worn hinge hole will chew through a brand-new roller just as fast as the old track did. If the track itself is bent rather than just worn, replacing rollers alone won't fix the shudder - that's a track repair, not a roller job, and we'll say so rather than sell you parts that won't solve it. One honest limit: if the opener has been fighting a bad roller for months, the gears inside it may already be worn, and that's a separate conversation.