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This is HO scale smokebox front for a Central of Georgia 4-8-2. The outside diameter is 82", and the holes are designed to accept Tichy .020" rivets. The model consists of an inner and outer layer, connected by a sacrifical ring. The inner layer has the hinge and dog details, leaving the outer layer smooth, for easier sanding prior to assembly.
To assemble, carefully cut the two layers apart, then sand the back of the outer layer smooth. Adjust the outside diameter of the inner layer so that it is a snug fit inside the smokebox of the locomotive, either by adding or removing material around the perimeter as needed. Insert the inner layer ito the inside of the outer layer, opening the holes if nessecary. The hinge straps and door dogs should sit just proud of the surface of the smokebox door. Glue the teo layers together, then insert Tichy .020" rivets in each of the holes to complete the model.