The 8608 Potentiometer Adjustment Tool is the most popular seller for adjusting trimmers and potentiometers.
Material: Nylon Shaft: ¼" (6.3mm) dia. 4 15/16" (12.5cm) long Ends: 0.85" (2.2mm) wide steel tip; 0.85" (2.2mm) wide steel tip, recessed .040" Total Length: 4 15/16" (12.5cm)