Early model (conical) 3 blade spinner for Me/BF-109. Designed for 35" wing span GWS model using GWS/ Towerpro motors or similar with 3mm threaded shaft.
Needs 3mm machine screw for front, and "GWS threaded spacer" to connect screw to threaded shaft; or can use 3mm coupling nut - (http://www.mcmaster.com/#93590a103/=yfs7tw) or similar.