Help! I know I read somewhere how many dowels to put in a 16" round cake, but now I'm about to dowel my cake for a wedding and I can't remember where I read it, nor do I remember how many! I'm doing a 3-tiered stacked cake. First tier, 16", 2nd tier, 12" and 3rd tier 8". I'm pretty sure I put 5 dowels in the 12" to support an 8" cake. Help!

according to Wilton: 6
http://www.wilton.com/wedding/makecake/building/dowelrod/dowel_tiered.cfm (look near bottom)