Reaction at the axis

A uniform circular disc with centre O, radius r and mass m is free to rotate in a vertical plane about a horizontal axis passing through a point A on its circumference. The disc is held at rest with AO horizontal and is then released.

When AO makes an angle θ with the downward vertical through A, find

(1) the component of reaction that perpendicular to AO at the axis
(2) the component of reaction that parallel to AO at the axis
(3)the magnitude of reaction at the axis