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it is possible to change the value of fixed composition resistors for experimental purposes and low power applications. All that's necessary is to notch the resistor with a file or grinding wheel. Connect an ohmmeter to the resistor during the grinding and stop the operation when the resistance reaches the desired value. Of course, the original resistor must always be lower in value since this method increases the resistance. It also decreases the power rating to some extent. The only limitation to this process is the physical size of the resistor.
R. C. Benson, W1HAC.