Nothing complicated about it. Put tape on the metal part of the sg where the stock used to fit put the stock back on, fill the hole where the wood used to be. When it sets up remove the stock, the tape will prevent the JB Weld from sticking to the metal. This is for a stock that has broken. If you want to prevent this from happing take the stock off look for shiny spots where wood and metal contact (where the op's sg broke) sand them a little and put sg back together. KEY word here is a LITTLE.