Hello

I am hoping someone can advise me of the most accurate way of cutting a
¼ strip of wood from a plank six feet long. I need to save the wood
strip for something else and the strip needs to be pretty much spot on.
I suppose a six feet straight edge (which I do not have) would be the
answer and then run a circular saw along it...
A six feet battern probably would not be accurate enough.
Any suggestions please.
Thanks very much