After being made aware of a loud screeching sound from the dryer by a family member, I began googling using the LG model number and noise. I was returned the standard long list of possibilities and youtube videos.
I searched for a tech manual of the dryer (one that shows diagrams, parts, etc.) but could not find one. So, I watched several short youtube videos on how to take the dryer apart. This one being helpful --> https://www.youtube.com/watch?v=Gijrvkg_ePE - I will note this is my first time taking a Dryer apart.
Then, after getting the dryer apart somewhat, and by making an educated guess on the issue I googled the roller part number, 4531EL3001, and was returned several sites. After reading reviews, etc. I decided on using the Appliance Parts Pros website because of their informative videos, and FAQs that noted the part 4581EL2002c replaced my part. I ordered the parts, and they arrived on the date or sooner as expected. It is nice to have a place, ship items as advertised.
Having taken the Dryer apart once and put it back together (I wanted to make sure I could get it back together) I arranged to have a family member assist with the replacement of the two (2) front rollers, when the part arrived. Having two people makes the effort a lot easier, I would also suggest using a hand free drill because the amount of torque required to get some of the phillips screws off can be difficult, and take a few pictures along the way to assist with the re-assembly, and finally lay the screws out in an orderly fashion so you get the right screws back into the correct slots.
So, it took me 3 hours to take the dryer apart, get a couple of pictures for part numbers, etc., and put the dryer back together. Note several difficult screws to get off, and in fact I gave up on one (because I did not have the hand free drill.
With a family, and a hand free drill, less than 1 hour. the repair/replacement went smoothly.
All in all I would use this site again for parts, and more importantly their educational videos on how to do something.