Also looks small to me. If too small you will have some "play" at each "stop". If necessary, you can dissolve the epoxy in acetone. To check the size before gluieng, place it in one of the v-grooves and look sideways with a loupe (or reversed camera lens). Between 1/2 and 2/3 of the sphere should be above "ground level".Seems like it might be a little bit too small
Best of luck.
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