Give me a minute.
Okay, I have the photo, but I cannot find my data cable for my Sonim phone. If you PM me your cell number I can text the photo to you.
Sitting at the back of your 3120, the cable comes into the carb box on the right side, proceeds towards the cylinder housing and you see the upside-down ledge at the top of the carb housing? Just behind the carb? The cable clips into that running to the left, then down towards you to connect to the carb mechanism on the left side of the carb. The cable describes a right to left loop so to speak, looking almost exactly like a question mark: ?