Minolta 50mm 3.5 macro

I thought I'd throw this to the world and see what came back.

I have the above lens and it has mould on the front lens. I have unscrewed every screw I can find on it trying to dis assemble it but to no avail.

Can anybody point me to a website that shows how to do this or offer any advice ( other than sending it to a repair man ) on how to get the damned thing apart?

Thanks in advance for any info, suggestions etc.

Frustrated as all h......\\

Lindsay T ( NZ)