This is not as common as a kinked cable which will keep the skeg blade deployed, a broken guide tube support bracket will allow the tube to flex rather than push the blade down.
Guide tube in it’s relaxed, skeg up, position.
Unsupported skeg cable flexing under the pressure of the cable pushing in the Down position.
New Bracket of plumbers epoxy putty tacking it to the surface
Encasing the Bracket and sealing to the surface with 5 minute epoxy.
Hudson River Paddler 