I'm trying to get a servo extension lead to fit the plug on a Savox 1251MG servo but am not having any luck. I've tried a few different ones and none of them seat properly on the plug (they go on about half way). Even the expensive genuine JR ones don't work[&o]

Has anyone else had this problem and has anyone found a lead that will fit? I'm almost at the point where I'm going to have to either solder on a new lead or swap the servo out for JR.

Thanks,