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Tool - Plumb Bob

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Plumb Bob 

Typical plumb bobs are 8 oz or 16 oz.  The best choice is 8 oz because the 16 oz ones hang too heavily on the cross strings which causes then to sag down and therefore give an error.  Any lighter than 8 oz and it won't keep the vertical string tight enough.

https://smile.amazon.com/gp/product/B00009OYGQ/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1    $4.35

http://www.homedepot.com/Energy-Star/Tools-Hardware-Hand-Tools/h_d1/N-5yc1vZ1xg1Zas71Z1z141o3/R-100113390/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053   $10


Having one 16 oz one can be useful for one off use down high walls.

16 oz ones are available for about $13 from: