First of all when you create a Figure through the Hierarchy editor  like in your case 2 props you need to make sure that both have the correct name, In the Grouping Tool and the Hierarchy. Both need to have the same names for a correct workflow, no additional group names for individual parts. 

Best way is to assemble by using spawn Props to have the correct position before you even think of creating the figure in the Hierarchy editor. After you have the correct parts ( Props ) assembled you hit create new figure ! now your figure will be saved in the New Figure Standard folder . The next important step is to load your new Figure and save it again as it has integrated geometry, this needs to be separated it will not work to manipulate the Joints correctly until the geometry is extracted. Do not forget turning off " Bend " on every bodypart properties ! The props often load with a _1 at the end remove the _1 on the names to have the corresponding name with the one in the Groups. 

After these steps you should be able to manipulate either the rotation or the axis position using the Joint editor in your new figure . 

If you have further issues you can send me a PM , and if you wish your model so that I can fix it for you. Do not need any credit , in any case it would be a solution to figure out what is going wrong with your props.