So, I replaced the alternator on my 2012 Challenger SRT8 and installed a new serpentine belt. Granted, I missed getting it under the idler, drove it 1.5 miles and the great folks at O'Rilley pointed out the mistake and we put on a new belt. About 5 miles later, I get all kinds of warning lights, pull over, pop the hood and the belt is loose. It is loose because the pully ring separated from the crankshaft pully and slid back, throwing the belt. One mechanic I spoke with said in 21 years he has never seen this. Have any members seen/heard of this? If so, got any idea how much $ it is going to take to correct? Thanks.