PART XI SCAFFOLDS, STAGES AND WORK PLATFORMS — Couplings
183
(1) Vertical frames and uprights shall be joined using coupling or stacking pins to ensure proper vertical alignment.
183(2)
Where uplift could occur and cause components to separate, height adjusting screws, castors, coupling pins, frames and uprights shall be secured to prevent separation of components.
Not legal advice. Verify the cited article against the signed agreement.