Correct, I meant nut, not bolt. Thanks.
The bracket can stay on the car without damage to remove the alternator. I've done it many times to save the trouble of backing out the bolt on the block. The tension bolt can also be removed from the bracket while still on the car. Just spin it clockwise and it comes out underneath the fan belt. Mounting the alt back onto it can be a pita for someone who hasn't done it before. Lining up the bushing etc.. Hence the suggestion of leaving it on the alternator so the owner could see how it looks.

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'70 F100 shortbed
'82 Diesel Westy
'83 Euro 300TD
Curtlo Viper
Yeti ARC
Surly long haul trucker