GVM camera slider polarity?

[beyond the blue]

I am looking to get a D/C power supply for a GVM GT-60D camera slider. Would anyone know the polarity of the d/c input into the controller? There is no diagram on the controller and no info in the manual. I have messaged GVM but not had a reply.

 

[Sangoma]

I am looking to get a D/C power supply for a GVM GT-60D camera slider. Would anyone know the polarity of the d/c input into the controller? There is no diagram on the controller and no info in the manual. I have messaged GVM but not had a reply.

It would be extremely unusual for it to not to be positive centre, maybe some one else with one could measure the power supply.