So I just saw, in the High Socks thread, Chuck K. post a link to an updated opinion on the "kneeling on a towel" question, and this was updated as of 4/2008.
In 2005, during a casual round, one of my buddies told me I couldn't kneel on a disc on some scraggly ground because it was "improving my lie". I pulled out my rules book, showed him that there was no rule saying anything of the sort, and that the only rule pertaining was the one about allowing devices that prevented abrasion. "Besides," I argued, "it's not much of a rule if I can get around it by wearing one of those neoprene knee braces, or a towel, or a mousepad for that matter."
So clearly I was mistaken? Or was I? When was this ruled illegal, and on what grounds? What was the reason for changing that decision? Is it now limited to a towel or pad, and not a disc, and what's the reason for the distinction?