Introduction
If your drive is having problems opening, the drive belt may have broken or fallen out of the track and you will need to replace it.
Tools
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            Insert an open paper clip into the small hole on the left side of the faceplate. 
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            After the tray opens, extend it fully. 
 
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            Use an opening device to push in the black tabs on the left, right and bottom of the outer chassis to unhook the faceplate. 
 
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            Carefully replace with the new belt by wrapping it around the larger gear first, followed by the smaller gear. 
 
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To reassemble your device, follow these instructions in reverse order.
One comment
In case anyone is interested, I used a 11/16” OD x 9/16” I.D. x 1/16” wall, for this exact drive (was a tight fit) and seems to work perfect.
I was so tired of replacing rubber bands every few months!
And yes this is an “O-ring” it should be less than a buck five eighty at your local big box hardware store.