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This part is intended to be used in building a semi-scratch 1/24 model of the Lunar Module. These are details of the descent stage : the plume deflectors for the LM ascent stage reaction control system.
Note that the plume deflector for Quad 1 is slightly different from the three other one since it need to be inserted into the HGA cover.
For indications on building the model please refer to http://spacemodels.nuxit.net/1-32 LM