Urgent HELP Replacing Accessory Belt

[LRGreger at aol.com]

I'm planning to drive to Mammoth tomorrow for several days of skiing, but 
noticed that the serpentine accessory belt on my wife's 93 90CS is badly 
cracked on the drive side of the belt.  I made a mad dash to the nearest 
dealer to purchase a belt ($56) only to find that I can't figure out how to 
detension the belt to replace it.  A friend had told me that there is a 10mm 
hex opening in the tension pulley, but there isn't, at least not that I can 
find.

Please respond directly to me, lrgreger at aol.com, since I am currently only 
subscribed to the digest list.

TIA
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