Here is a volume knob with a more visible indicator. Looks to be a perfect size too.
mxuteuk Silver Aluminum Alloy Potentiometer Control Knob Volume Audio Electric Guitar Bass Screw Type 34 x 17mm (dh) KNOB-03-34SR https://smile.amazon.com/dp/B07TVRC19P/ref=cm_sw_r_cp_api_fab_7B1EFbTV82P25
mxuteuk Silver Aluminum Alloy Potentiometer Control Knob Volume Audio Electric Guitar Bass Screw Type 34 x 17mm (dh) KNOB-03-34SR https://smile.amazon.com/dp/B07TVRC19P/ref=cm_sw_r_cp_api_fab_7B1EFbTV82P25