Ayuh....
Thin, flexy stick (Yardstick'll do, but thinner would be better). Secure at
each end (clamps, couple of nails, whatever) pull down to a known depth,
whatever suits your fancy. (e.g. 8" for a 4' span) Mark with marking tool
of your choice. Cut with jigsaw or other favorite motorized or non
motorized cutting tool.
Don't forget to cut your stick a decent percentage longer than the span
you'll be marking.
"Bill" wrote in message
news:tDhYf.78819$oL.65308@attbi_s71...
anyone know how to do the scallops on sabre scalloped fences? -with spaced
pickets
such as he http://www.elyriafence.com/RR3.html
thanks