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This parts is intended to be used if you are building the 1/32 Apollo spacecraft from Monogram/Revell. It will be added to the top of the service module between the upper radiators. If you have a LPD or SLA printer you can also download the files on Thingiverse. For further explanation on how to use this part please refer to my website : http://spacemodels.nuxit.net/1-32%20CM/index.htm