Here is what worked for me.
Cutting hole in gutter for downspout.
Step 2 drill four holes in each corner of the outline you made of the sleeve drill one hole.
Make sure the patch is large enough to overlap the hole by at least 1 in 2 5 cm on all sides.
On the bottom of the gutter itself take a pencil or marker and trace the outline of a sleeve.
Slide a rivet shaft into the rivet gun.
Press the head of the rivet into the drill hole and squeeze the handle of your rivet gun to lock the rivet into place.
If the patch isn t already small enough to lay flat against the inside of the gutter and over the hole cut it down to size with your metal snips.
Repeat the drill and rivet on the other side of the downspout to connect it to the main gutter.
How to cut and install a gutter outlet.
Drill through the side of the downspout and into the connector.
Step 1 is to draw the shape of the hole and drill s few holes around that shape.