Complete with O-ring seal

If it won't hang from a screwdriver then it needs to be replaced

Chrome plated steel

These threaded

Once you have done it replace it with this brand new allen sludge trap plug

Classic 1 inch Master Cylinder Polished Aluminum - 14 mm Bore Brand_Cycle Craft Complete with O-ring sealMade from forged aluminum body, the Classic line master cylinder by Kustom Tech in Italy comes in fully polished aluminum body, lever and finned cover held in place with two screws. The compact size with finned cover and the smooth lever will give a very retro style look for all custom projects. It fits all 1" handlebars and has a 14 mm bore size. For use with DOT 4 or DOT 5 brake fluid. The included banjo bolt is 10mm x 1. 00.