Machine Design
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

2 d
1 d
2.5 d
1.5 d

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Machine Design
Turn buckle has

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

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