FJ Westcott 50" Softbox

[DavidG]

Ive just bought one of the 50" Recessed Front FJ Westcott JS Apollo softboxes.
I have mounted it on my lightstand with a Manfrotto 026 Swivel Umbrella Adapter.
I am only able to tilt horizontal/up because if I attempt to tilt down the lightstand entering through the back gets in the way.

Is there any way to get this lightbox to point down?
Even with the umbrella shaft pushed the whole way in the softbox only achieves a very small downwards tilt.

I have posed this question to the manufacture but I thought someone here may have experience with them.

Thanks,