Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Make M/I constant throughout the length of the leaf
Have variable bending moment (M) in each leaf
Obtain variable moment of inertia (I) in each leaf
Permit each leaf to act as an overhanging beam

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Machine Design
Turn buckle has

Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends
No threads
Left hand threads on both ends

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