1974 850 mercury thunderbolt blue band

by Robert
(Camdenton)

I have to remove the lower unit. I see an arm that might have a screw in it or an allen. I saw a nutt on one video and the other just slipped out. Mine looks more like a screw. I don't know exactly and have to fish several boxes to get the angled screwdriver so anyone know exactly what I am looking for? An allen or screw head in that arm?

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