This is a Vortech 4" Aluminum Two-Blade Spinner from Dave Brown.

Features:

• Light-Weight Aluminum Construction
• Polished, Brushed Aluminum Color
• Includes Four Plastic Backplate Bushings, So The Backplate Will Fit
• Securely Around Any Ordinary Crankshaft
• Designed for Two-Bladed Props

Includes:

• One Two-Blade Aluminum Spinner (For Sizes See SPECS)
• One Aluminum Backplate
• One 10-32 x 3/4" Cap Head Mounting Bolt
• Four Plastic Backplate Adapter Bushings
• One Instruction/Information Header Card

Requirements:

• Vortech Adapter Nut (See COMMENTS)
• 4mm Allen Wrench (For The Cap Screw)

Specifications:

• Spinner Backplate Diameter: 4"

Comments:

To Attach the Spinner to the Engine, the Modeler Must Use One of the Following Adapter Nut Sets:

• Note: Use A Short Adapter With Spinners 2-1/2" And Under.
• Use A Long Adapter With Spinners Above 2-1/2".
• 1/4-28 DAVQ8428: for OS .25-.60, Supertigre .25-.60, Fox .19-.50, Enya .25-.53, K&B .19-.65, OPS .40-.60, Webra .28-.80
• 5/16-24 DAVQ8524: for OS .61-.90, Supertigre .61-.90, Fox .60-1.2
• 7x1.0mm DAVQ8710: for Enya .35-.60, .60-1.2 Four Strokes (Non R Engines)
• 8x1.0mm DAVQ8810: for YS .90-1.2 4-Stroke, Enya 1.2R 4-Stroke, OPS Super .60 and .61 5-Port
• 8x1.25mm DAVQ8812: for All YS 2-Stroke, OPS Maxi .30, Webra .61-1.2

The Stock Numbers Above Are For the Short Adapters.
It Is Best To Use The Longest Adapter Nut That Will Fit.