The bridge location was triangulated before old soundboard was taken out of piano. Clamp new soundboard in, triangulate new bridge according to the old one. Trace bridge location.
Transfer rib line to the bridge mark using jig.
Pick 3 to 4 places where ribs meet bridge across bridge length, drill for locator pins. Install pins, transfer the mark to bridge bottom.
On bridge bottom, drill and dowel at the pin marks.
Look at the soundboard button location on old bridge both from top and bottom of the board. Use a thin bit, drill mark where to install new buttons, drill through the board.
Brush glue on bridge bottom, push dowels into locator holes where locator pins were, lock the bridge down. We use this go-bar type pressure device to fasten bridge to soundboard. Clean glue squeeze-out thoroughly.
The next day, glue is dried. According to the little drill marks we made, glue on soundboard buttons, fasten them down by screws on washers. When glue is dried in about 30 minutes, drill for and tap dowels in about 1mm into bridge bottom. trim and sand flush.
Yeah done for now. And there is a little button at the very treble side of the bridge. We'll later sand with 220 grid paper and spray with sealer then semi gloss finish.