"George" george@least wrote in message
...
Why not the washer and pencil trick? Template to wall, pencil inside
washer, roll down the wall.

That sounds easy, but you left out all the important details.

What type of pencil? Is a #2 the #1 pencil for the job?

What about the washer? If it is a bath or kitchen will you need brass
washers? Can you substitute a plated one?

If north of the equator does the washer have to rotate CW or can it go CCW?
If one is preferred, what do you do on the wall on the opposite side of the
room?