Stevan Thomas wrote:
> I also occasionally use one of those carpenter
> things that's magnetic, and put it on the headtube
> to see what that angle is in relation to gravity
> (absolute down). That tool isn't necessarily as
> accurate as the machinist
> tool, and you have to do it on a board that is:
> #1 Straight (sight down it)
> and #2 Adjusted for level (absolute horizontal).
To use the carpenter's angle finder, measure twice with the bike pointing in opposite directions, and average the results (aka split the difference).
-- Craig Sandvik Berkeley, CA (where the kitchen floor has the same upslope as some Rivendell top tubes)