I also have bought several of those motor types. I'm not defending Greyson or bashing anybody else. But it seems they rarely fit perfectly. Usually it's when they tap the holes it seems there is always a burr. And don't even get me started on my plastis stick mounts. Form motors that don't mount to ARF's that aren't that's just the way it is. And just because EVERYONE does it dosen't make itright. Live long enough and you'll probably do it too. Respectfully sir 10yrs in the hobby and thisit your first bad mount, I was I was that lucky. Good luck in the future. Good video but a Scanning TunnelingMicroscopefocused on the inside of the mount would have been slightly more informative