solentlife
The Hobby King CoG stand - after carefully thinking about it - it dawned on me how to cure the design fault in it.

The grub screw that stops the balance assembly from falling of the pivot ball - restricts the movement of the balance arm as it hits the pin its sitting on. The grub screw is threaded in the pitch moment part of the support :

[DSCF8513_zpsrhpjzzie]

The movement is such :

Opposite to the screw and plenty movement ...

[DSCF8517_zpspfrvhhpd]

But in same as the screw - the movement is substantially less ... 

[DSCF8518_zpsz2hnbh2m]

The solution was simple ! Drill and tap into the side so that the screw never interferes with movement :

[DSCF8514_zpsh3hzpkhy]

Now the balance arm is secure - but free to give all movement both fore and aft.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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