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Attaching the UCP, UPA and ULA assembly to an MRS2 rail
1. Insert the D-nut into the groove on the underside of the MRS2 rail by rolling into place.
2. Align the ULA base plate assembly and the screw with the threaded hole in the D-nut.
![Attaching the UCP, UPA and ULA assembly to an MRS2 rail](/cmmsupport/knowledgebase/media/img/gen/d50b9e8b7eac44f98be7d59221115e72.jpg)
3. Screw in to place and tighten fully.
![Attaching the UCP, UPA and ULA assembly to an MRS2 rail](/cmmsupport/knowledgebase/media/img/gen/cc94f4f3f21f4ea891bc0dae491c3eb8.jpg)