Map Ins key in .Xmodmap

Hello, I've been trying to map the Ins (Insert) key to Cmd-Down in the .Xmodmap file that I use for my Wineskin project, as described here: [http://www.columbia.edu/~em36/winekeymap.html] Nothing I try with "keycode 125 = " seems to have any effect. Can anyone help with getting the Ins key to work in a Wineskin app? Thanks for any help.