Sinker Bar 2 : A heavy weight or bar placed in the wireline tool string. The bar adds weight so that the tool will lower properly through the well fluids. (WLOP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}