Great Planes PT-17 Stearman .91-1.20 ARF - GPMA1349 - Manual (Page 18)

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8. Attach the pushrod wire to the throttle arm with a brass
screw-lock pushrod connector, nylon retainer ring and a
4-40 x 1/4" [6.4mm] socket head cap screw.
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1. Glue four 1/4" x 1/4" 1/4" [6.4 x 6.4 x 6.4mm] hardwood
blocks to the firewall. Locate the blocks on the marks making
certain that the side of the block is flush with the side of
the fuselage.
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2. Slide the fiberglass cowl onto the front of the fuselage.
Cut the cowl as needed to allow the cowl to fit over the engine.
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3. On the front of the dummy radial engine draw a circle
approximately 1/16" [1.6mm] larger than the diameter of the
thrust washer on the front of the engine. Be sure the hole is
centered on the dummy radial engine. Cut out the circle.
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4. Cut out the back of the dummy radial engine.
Install the Cowl & Dummy Radial Engine
18