Hi all, I remember someone else mentioning this a year or two ago. I searched the archives and didn't find the post. The holes in the back of the prop were to small for the drive lugs to fit in. I finally got around to mounting this prop on my new Kitfox build, and if I forced the prop onto the drive lugs, I would need a hammer to get the prop off. I could push a drive lug maybe 1/16" into the hole with my thumb. My first NR prop didn't have this issue, I got it maybe 6 months before this one. Anyone remember what the solution was that NR said to do? I'll email them tonight, but sometimes it takes a while before they answer. Thanks, JImChuk