A fishing rod foundation and methods for constructing and adjusting a fishing rig. The fishing rod foundation may include a cylindrical element inserted in a tubular, the tubular having at least three portions. The first portion and second portions may be configured to receive a rod blank. The third portion may be configured to provide a stop for fishing rod parts to be added to the fishing rod foundation exterior. The third portion may include a threaded section that engages a locking nut for locking and unlocking the position of the cylindrical element relative to the tubular. The method may include construction of a fishing rod by adding a rod blank and other parts to the fishing rod foundation. Another method may include adjusting the fishing rig using the locking/unlocking feature of the fishing rod foundation.