CARE OF PLUMB BOBS
Handle plumb bobs with care. Do not use a plumb bob
as a hammer or lever. Lightly coat plumb bobs with
lubricating oil for short periods of storage. For long-term
storage, apply a heavy coat of oil and wrap the plumb
bob in oil-soaked paper.
Store plumb bobs in a protective box in a dry place.
Make certain threads of removable caps (1) and points
(2) are lightly coated with lubricant and placed in a