Have a body blank with no neck pocket route but FR route and posts are done have a 25.5 scale neck I DO understand that its measured from the nut and where it breaks on the bridge saddles. My question is I'm using a used FR where the saddles have been intonated on a old guitar so what saddle do I measure to? do I move all the saddles to the rear as a new FR or Forward or what lol thanks for any input.