This is a Spinner Adapter Kit by Great Planes.
FEATURES: 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 26-52 Surpass and FS-70 Ultimate
One year quality guarantee
Installation instructions provided on the header card
INCLUDES: (1) Propeller Nut
(1) Propeller Jam Nut
(1) Propeller Washer
(1) Aluminum Backplate Bushing
REQUIRES: 12mm Wrench To Tighten Propeller Nut
Aluminum Spinner w/Center Mounting Hole
SPECS: Shaft Size: 1/4-28
Jam Nut Length: 15/16" (24mm)
Backplate Bushing Inner Diameter: 1/4"
Outer Diameter: 3/8"
COMMENTS: This adapter fits the FS-70 Ultimate not the regular FS-70.