I found these instructions for a “sun funnel.” It’s proposed use is for the 2012 transit of Venus. I haven’t been able to use it for any occultations, eclipses, or transits yet. I have used it for sunspots. Its two great advantages are that it allows a small group of people to view at once and that it removes any concern about eye damage.
For solar use I built another cap (out of plywood scrap) for the telescope that reduces the aperture to two inches.