Trans leak from small metal cylinder

As mentioned above, it appears that the retaining pin was replaced with a bolt at some point? That could allow fluid travel along the threads.
nope.. the o-ring is in past the bolt.. it shouldn't leak. BUT he said the cable housing is moving in and out, thats why it's leaking.. he just has to make a bolt with the bevel on it to hold the cable in place.. then new o-ring and silicone and it will be fine