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.
Definition of VANILLIN. : a crystalline phenolic aldehyde C8H8O3 that is extracted from vanilla beans or prepared synthetically and is used especially in flavoring and in perfumery.irst Known Use of VANILLIN. noun vanÂ·ilÂ·lin \Ëvan-Él-Én\. : a crystalline phenolic aldehyde C8H8O3 that is prepared synthetically or is obtained as the chief fragrant component of vanilla extracted from vanilla beans and that is used especially in flavoring and in perfumery.