I'm in the process of trying to clear out a huge amount of dust (and a bug) from a retina reflex III (041) and I've removed the top cover. I'm stuck however at removing the prism.
Looking straight on from the lens side, there are two screws to either side of the prism as well as on in the rear. The three larger ones that are accessible have been removed however it appears that the light meter needle needs to be dealt with in order to remove the prism so as to gain access to the focusing screen.

Can anyone offer some additional information as what next step would be.

Thanks