I havnt but i'v just had this made as my lead nut, Dom from these forums made it for me as of a conversation we had over msn messenger one night. Its 1" Ali with an M8 hole.

i'v included a pic and a pic of what it is going to replace, i'm hoping i wont get any backlash and i'm thinking over time and use the thread will slowly get worse but i'v never used anything ali like THIS so i dont know.

Not much help but a reply never the less.