Hi Ty!
Im good for another one or two of the new design. It would definitely make for a faster change over from a static prop to a flying prop. What size center hole and bolt size are you planning for the cone mounting screw.? The reason I ask is that I am planning to have a new prop adapter made for the E-flight 160 motor . I am using the four screw mount and have discussed this morning with a CNC machining company to make a new adapter with a longer shoulder (about .5-.75 inches longer) this would allow the motor to sit behind the existing Me-109 nose bulkhead and project through the existing hole and to mate to your spinner which has about a 3/8 undercut on the back spinner plate. I will have an internal thread put into the tip of the threaded shaft for the spinner cone. This company(owned by an R/C modeller) has a lathe with milling attachments so all the machining is done once set up so this will hopefully prevent any of slightest misalignment. Tero T in Toronto