Hello group....i am new to the board. i have a couple questions. i have a early 90's D-40 i just purchased. it is an awesome guitar, but i need to know a few things. what is the best polish to use on the back of the neck...it seems to get sticky back there quite easily. and also the input jack is the only strap button on it....where would you guys suggest i have the other one put in, or should i look into alternative ideas to keep the sound and the finish original ?