What about the Mamo from Horizon Hobby? Will it fit?
http://www.horizonhobby.com/Products...?ProdID=MAOUSD
"it does not require a hollow shaft motor. It will include two set of blades 8" & 9" and will also be selling replacement parts. The most common to replace are (2) 2mm x 12mm screws that are sold by Du-bro in a pack of four."