New to me MFB

chain drive is a noisy system that may impart vibrations into the work
i can't imagine why someone would desecrate that machine like that :bawling:
 
The only thing that I can think of would be that the chain can be replaced without pulling the back gears and spindle. But aside from less torque transfer capability, the same thing could have been accomplished with a link belt (as much as I dislike saying it).

Derek, I would not run it with the chain that slack. Even if it means having to loosen the tension adjustment as well as move the tension arm in order to change the sprockets that the chain rides on.
 
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