You're absolutely right...I used a 12 point socket :( I'm going to try the nut splitter in the next couple days. Thanks for all the help!
I actually did some more investigation and realized that there is a chunk missing from one of the idlers so I'm pretty sure that is the culprit. I tried to unscrew the nut holding the idler on to replace it but it is on there really tight and I ended up rounding off the nut after trying to break it loose for 30 minutes. Any ideas on what I'm doing wrong? The part is Idler Flat, part number 532 19 43-27 (item 50 on page 8 of the attached). The nut that I've rounded off is 873 90 06-00 (item 51 on page 8 of the attached). I have the clutch pushed in while I'm working on it...does that matter? Is there a different method of replacing the idler other than unscrewing that nut? Thanks in advance.