I did a Pinning tutorial ages ago.
It's in french but pictures are self explanatory.
The first one is about antigrav, the second about an arm.
Remember that this is not required that you glue the base to your miniature, even after pinning.
I used this technique for both my raiders and venom and it works great (better for transporting them).
I also used ot for an old model talos, which I did 2 pinning (with 2 transparent sticks), on a 50mm GW base (from old basing kit). I don't have pictures for the Talos but I can make some if you're interested