my homemade mod worked great. it was the bottom of an aluminum can. i just cut it off with a knife (very dangerous and many sharp edges) and bent it into a dome shape with a pair of pliers. more smoke / flavor with less heat (and of course saving shisha).
i noticed someone used a 3/4 inch copper pipe stop to make a mod and people said it was a bad idea because of the heating of the copper. today, i found a 3/4 inch brass end cap for $1.50 so I figured to give that a shot too. will update after i try.
btw, sorry for no picks, i don't own a digi cam. i'm lame...