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Hi, I have a * dryer that just developed a small rattle. What's odd is that the rattle doesn't start right away; it kicks in 30 seconds after I start the dryer. I lifted the top and popped off the back grille so I could see it in action, and I don't see anything obviously amiss. The pulleys all seem to be turning smoothly. There's a hot metal smell (and it's heating and blowing out air), but no burning smell, so that seems normal, too. I took a short video. You can hear the bit where the sound changes from the normal operating noise to the rattle. Video with the rattle starting about 5 seconds in. Any idea what could be causing this? I've been keeping this machine going for many years, but it keeps plugging along with different bits getting replaced over time. Is it time for a new idler pulley or rollers? It's weird, though, that the sound doesn't start right away. Whether the dryer is cold or already warm, it starts 30 seconds after I turn on the drying cycle. Thanks, Erika