Here is a new carburetor adjusting knob 277879 for 3 to 5.5 hp Evinrude outboards. Lightwin, Yachtwin, and Fisherman (1950s). 1950s and 60s models. Its size would be for the low-speed function. For hollow-shaft adjustment valves.  Ask all questions first please! Sold to the USA and elsewhere through the eBay global program only and mailed out within one business day. Thanks...