Thanks again Jack.
I found a manual for an earlier model that has been helpful.
I managed to get the belt back on without moving the cutter deck!

All it took was good lighting, axle stands, cranking the engine pulley to enable me to force the belt down below the pulley so it could be turned inside out to get it in proper mode, then carefully aligning it all around the cutter pulley and the lower engine pulley.

It's working now. Yay!

Thanks again for your willingness to engage with a newcomer.
Learning as I go....

Cheers,

Scott