This is a Spinner Adapter Kit by Great Planes.
Adapter kit for aluminum spinners
This steel adapter kit tightens the backplate & propeller onto the engine, then using a single bolt-on design, holds & centers each spinner perfectly on its baseplate.
Machined for accuracy
This spinner adapter kit will fit the following engines:
-O.S. FS 70-120 Surpass **Does not fit FS-70 Ultimate**
-O.S. 1.40 RX
One year quality guarantee
Installation instructions provided on the header card
(1) Propeller Nut
(1) Propeller Jam Nut
(1) Propeller Washer
(1) Aluminum Backplate Bushing
12mm Wrench To Tighten Propeller Nut
Aluminum Spinner w/Center Mounting Hole
Shaft Size: 5/16-24
Jam Nut Length: 1" (25mm)
Backplate Bushing Inner Diameter: 5/16"
Outer Diameter: 3/8"
The correct adapter for a FS-70 Ultimate is GPMQ4585.