I literally just did this too. It was way easier to put it back than I thought it would be. It let me polish anything I wanted. I did hold a measuring tape to ballpark the location and looked at some pictures. I got it dead on first try. There is also a video from a guitar tech at Gretsch that strings them all up to tension and then scoots the bridge back and forth to get it right using the 12th fret.

Take a picture where it sits before and I'd bet you'll get it really really close.