To add a Balsa Cowl I built the Fuselage as per the plans but did not put any glue on the fuselage sides and doublers forward of the firewall. Once the fuselage was built I cut off the cheeks forward of F1. (Not gluing the Cheek sides and Doublers together means you can use one of them to make the Spinner Ring later on).



I then marked the new Thrust Line 1-7/16" down from the top.

Make a Spinner Ring from one of the Cheeks by tracing around the Spinner Back Plate (2-1/4") cutting it out then cut a 1-3/4" diameter hole in the centre of the resulting plate.