The best material for a shim is a thin piece of maple veneer. Most bolt-on necks are made of maple, so it makes sense to make a shim from the same material. The wood can be easily shaped to fit the neck pocket and angled to the proper degree. I typically start with a piece of maple about .060 thick.
Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants and some algae.[1] Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily.
A dried extract made from the stomach lining of a ruminant, used in cheesemaking to curdle milk. See rennin. [Middle English, probably from Old English *rynet.] rennet, substance containing rennin, an enzyme having the property of clotting, or curdling, milk.It is used in the making of cheese and junket. dried extract made from the stomach lining of a ruminant, used in cheesemaking to curdle milk. See rennin. [Middle English, probably from Old English *rynet.] rennet, substance containing rennin, an enzyme having the property of clotting, or curdling, milk.