Help with Removing Hayman Reece Towball

Hi All,

From the outset I will admit I am an idiot for letting my current problem occur.

But now I have this problem I am hoping for some advice (if possible)

I came back from a trip to Moreton Island, and thought I cleaned everything down thoroughly.

But 2 weeks later, I find out my slide in - slide out hayman reece towball seemed to be stuck in the hayman reece coupling.

I can remove the pin, but not the slide-out coupling

I assume this is from corrosion & sand build up.

I have applied heaps of WD40 but no good.

I can not get behind the coupling to hammer out because the fuel tank is in the way.

I am trying to avoid completely removing the tobar if poosible.

All advice would be greatly appreciated

Thanks

TonyG