Momo steering boss fitting - any advice ?

[N17 TVR]

I've got the wheel + the correct(?) boss Momo part no xxxxxx6605, but no fitting instructions

I've found 3 previous threads on this subject with advice from GAZ_3884 in particular.

Can anyone offer further advice on how best to fit the new boss and wheel.

I am a complete wit with this sort of thing, so please speak s-l-o-w-l-y

Thanks in advance