The mower deck belt to my Craftsman YTS4500 Lawn tractor slipped off the front spindle. The manual calls it the "M" spindle. It's not broken, and still correctly routed through the other spindles/pulleys. Is there an easy way to slip it back on? The manual says to release the tensioner rod, but it doesn't tell you how to do that.

Rod should be on left side of deck.
When released should be loose enough to put belt on.