Can anyone recommend a saddle that will sit a little higher on the seatpost? I need about one inch extra height on a KHS-Westwood to be comfortable. The seatpost is currently on the insert limit line. Alternatively, what might the tolerance of the seatpost be? Could I safely take it one inch beyond the limit?
No. If it has a shim it will destroy it. Otherwise, it might damage your frame. The point at which the post goes into the frame serves as a fulcrum of sorts, so if it's too high, it can spell trouble. This is also dangerous.
If you like your saddle, why not just get a longer post?