In a classified add it was mentioned about making multiple inlays and getting them the same. A method I have used for making duplicate inlays , is to make a multi layer sandwich , by using contact cement between the pieces. I have done up to six layers while making inlays for wedges and pins. Glue your pattern to the top. As long as you don't get carried away and, over heat it , this will hold together pretty well. I have put the "stack " in the vise , with moderate pressure to cure. After the desired shape is achieved , a little heat from a propane torch will separate them, then clean off with a little alcohol. This is the simplest method I have found to make duplicates.