I am about to do some gold inlay for the first time. My question is how deep should channel go where the gold is to be pounded into? Also, I will be using 18k gold wire and am wondering about the relationship between the width of the wire and the width of the channel. I assume the width of the gold wire would have to be wider than the width of the channel. Correct? If my theory is correct about the width relationship how much wider does the wire have to be in relation to the channel?