During a previous allocated beam time (proposal 5-41-911) it was possible to confirm the presence of a structural dimerization effect in NaFe(WO4)2. This effect is directly related to the strong thermal expansion anomalies upon entering the commensurate phases. After the qualitative confirmation of this dimerization effect, the residual beam time was not sufficient to measure as many reflections as would be necessary for a structural refinement in these commensurate phases. We propose for a continuation of this experiment in order to obtain sufficient data for a structural refinement and hence, for a quantitative determination of the structural distortion and dimerization.