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These parts are designed to upgrade a Roco Minitanks Humvee. You will need a Roco/Herpa humvee kit as a starting point. Parts included are: new rear bumper, and four new 24 bolt wheels. There are enough parts for 4 vehicles.
To use this kit start by cutting the pieces from the sprue. Clean and paint all parts in accordance with Shapeways guidance for detailed plastics. Be careful, as these parts are delicate.
Rear Bumper - glue this to the existing rear bumper, lining up the holes for the pintle hook. Either of the Roco pintle hooks (open or closed) can be used with this bumper.
New wheels - Make sure to thoroughly clean all support material from inside the axle holes (I use a dental pick type tool). If this is not done, the axles will not insert fully into the wheels. Once this is done, the wheels simply replace the originals, using the existing rubber tires as well and axles.