First of all, you'll have to build a gimmick every time you want to perform this. There is no
borrowing a bill and making it happen. You CAN have the spectator sign the bill (provided they sign
the right end of it) and you can show it to them restored at the end. But they cannot examine the
bill no matter how you perform it, and that's a major shortcoming in this effect. The spectator is
naturally going to want to grab the bill to see it restored after the effect is done. That just
makes sense. The fact that you have "restored" the bill but have to keep it moving so they can't get
a good look at it, and you have to put it away quickly after doing the effect, will take away from
restoration.
Yes, you can swap the bill out after the restore for one they can examine, but
if you're going to do that what's the use of doing this effect in the first place rather than using
the old switch out methods of the past? The restoration is visual, yes (at least on one side), but
I'm not sure this is one you'd perform often. It would have been so much better to end this with a
bill you could hand out somehow.
Credit has to go to Menny though for the novel way you
ditch the torn half of the dollar. It's the first time I've seen it done with a money trick like
this. That's interesting, but it doesn't necessarily warrant a purchase. In the end, this is just
one you'll have to judge for yourself. If you want a trick that's visual with limitations and you
have crowd control to make sure no one snatches the bill out of your hand after the restoration, you
might like this.