laying out a bow

[ChuckC]

I have been using a string with weights to help initially lay out my bows.  Makes a nice straight line.  But it is not without some draw-backs.  Has anyone ever put together and used one of those laser leveler systems on its side to create a straight line to do this instead ?  Be much easier to go around the curves accurately and to draw a line without pushing the string over too far.  Anybody want to share their easy method to do this ?
ChuckC