Great set of pictures, This is a project I would like to try in the future. How does one raise and lower the rear wheel on this Carriage? Looks like the axel pin has to be removed. Also, does any one here know if plans from Antique Ordnance Publishers --No. 55 Civil War 12 Pdr DAHLGREN Light Boat Howitzer on a Landing Carriage are for this carriage?