This still may not be large enough. http://s3-production.bobvila.com/articles/wp-content/uploads/2013/10/plumb-line.jpg
My old brass plumb bob works well as a cone when inverted. They usually have
female
threads on the non-point end. Mine is about 6 cm or 2.5 inches. I have it on a
small, 2 foot long
meridian dial. sasch stephens
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