Abstract: A method of assembly, tightening and locking fixed weight dumbbells and barbells which is commonly provided with weight plates whether individual or one piece styles, a handle or bar with or without an end plate and a locking female member to retain plate(s) to the handle or the bar. The locking member consists of a spring steel oblong threaded insert that can be installed in any shape body i.e. hex, square, round etc. The insert threads over a threaded handle or bar and retains the plates in different size weight configurations. The threaded insert goes on under light hand tool pressure and conforms to the threaded handle or bar. Once applied pressure ceases it locks into position. It may be adjusted as needed and will riot loosen under shock or vibration. It will lock wherever it is left and is considered tension adjustable. It will adapt to wear and may be tightened or loosened as many times as the circumstances require.