I am thinking of improving the air circulation in my attic by installing some
of the round eve vents. I can figure out how to install them, drill a hole the
right size and push them in,but how do I make them stay there? My experience
with things I just push in is not very great. They have a tendency to fall
out.

The ones I looked at at Lowes are just round plugs, with nothing to hold
them in except friction. Do they make any that have something to hold them?

Thanks
Bill Gill