Well seemingly I was erroneous - as pointed out by Dave Bates who recently sent in a photograph of the said device. Closer examination revealed that this was in fact ZK-HBQ.
Looking at my own pics of ZK-HBQ has produced another shot of her on the counter balanced arm.
Below is my version of the same rig taken on 14-11-1983.
ZK-HBQ was a Bell 47G-2 with the c/n 1694. It was completed in August of 1956 and became CF-JSJ with Pacific Wester Airlines at Vancouver from 30-04-1957. (PWA became Pacific Helicopters). It was sold in 1963 to Bullock Wings and Rotor Ltd of Calgary and canceled on 24-10-1966.
It came to NZ and had a rather varied career.
It was registered as ZK-HBQ on 24-11-1966 to Helicopter Enterprises Ltd; first flew here on 08-12-1966 and gained its CofA on 20-12-1966.
It endured an engine failure and heavy landing on 12-04-1967 at Manganui (sp?). Its post repair test flight took place on 22-02-1969 but on 11-02-1970 it force landed due to power loss on a beach near Wairoa only to be caught by the incoming tide. After a short period of storage it was listed to W N Champion of Auckland on 18-03-1970 and then back to Helicopter Enterprises Ltd of Hamilton on 01-05-1970.
It sustained more damage at Kaikohe on 14-04-1972, rebuilt, it first flew again on 02-08-1973, before going on lease to Central Helicopters Ltd of Alexandra in November of 1973.
I managed some pics of her at Timaru on 17-11-1973
Just after these photos it was damaged in some sort of a sabotage attempt.
Damage couldn't have been too bad because I got another pic of her at Timaru on 09-02-1974 (below).
Purely by chance I spied her at the Skippers Lodge (near Queenstown) on 01-01-1980.
After this we have the rotating arm arrangement at Queenstown from about late 1980 until around early 1984
Its registration was cancelled on 27-06-1984.
RAYNER123 has commented that it went to the USA.
A quick check of the FAA files shows that it did indeed go there and it became N7801P. It has been withdrawn from use. The last FAA action data was 01-10-2003 and it was purged from their register on 13-06-2011.
Thanks to Rayner123.