Attachable level indicator

A level-indicating-device comprising:

• (A) supporting means for a bubble tube, said supporting means comprising a plate-like portion,
• (B) a bubble tube fixedly supported by said supporting means,
• (C) nail guiding means fixedly attached to said supporting means, said nail-guiding means comprising a rigid tube comprising a threaded outer surface passing through said plate-like portion, synthetic polymeric nail-gripping material confined in said tube and nut means locking said tube to said plate-like portion, and
• (D) pointed nailing means slidingly gripped in said nail guiding menas whereby said device may be removably attached to a wooden structure being leveled.