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DerbyDad03 wrote:

I need to cut a 4" round hole in a soffit, from underneath, while
standing on a ladder. The soffit is not horizontal, it slants upward
from the gutter towards the house.

We may have some access to the soffit from above, perhaps enough to
drive a screw through with a right angle drill to locate the position
on the outside, but I don't think I have enough room to get a jig saw
in there.

My guess is that it will all have to be done from the ladder. I don't
want to spend upwards of $45 for a 4" hole saw and arbor for this one
hole, so I'm looking for creative suggestions from this fine group.

I'm think that I don't want to use a router, upside down, while
standing on a 28' ladder. I'm not even sure a jig saw will be that
easy to use.

The hole will be covered with the cover shown at the link below, so it
doesn't have to be perfect, I just need to feed (and attach) a 4"
aluminum elbow to the hole.

http://cdn.oneprojectcloser.com/wp-c...5/DSC_0135.jpg

Maybe just a series of holes drilled in a circular pattern will be
good enough, but I'd prefer soemthing a bit neater.

Suggestions?

My suggestion is a cheaper hole saw, since it's a one-off project:

http://www.northerntool.com/shop/too...8624_200518624

Standing on a 28' ladder, working overhead on a slanted surface, I'd not
risk my neck trying to save a couple of dollars by using the wrong tool.
So even if it was $45, I'd pony up.