those pesky nose bolts, now locate guide rail.

[Fenton Murray]

As long as we are locating things, how about some ideas on locating the 
damper guide rail.
My last job I pluged the holes, made a new rail and started over. I've 
frustrated myself trying to exactly locate the little number 8 screws, or 
whatever they are, drilling precisely in the right spot through the new 
soundboard, to catch the old hole.
Tips, techniques?
Thank you,
Fenton