Abstract: This article deals with the application of reactive moment acting on the mid-point of continuous beam with double-span under uniform load to replace the one for drill collar above the stabilizer for pendulum assemblies in crooked boles.Equation is derived for the determination of the optimal location to place the stabilizer.An analytical formuia for straight deviation-holes is obtained,analogous to the one used in woods-lubinski method,with an error of about 5%.