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This is the same top-quality SPA Design F1 Involute Spline Quick Release Steering Wheel Hub (Part No. 3405), except for the addition of a pre-wired 12 pin Lemo connector set. The electrical connections are automatically engaged or disengaged when the steering wheel is installed or removed. This hub makes it easy to add a variety of functions to your steering wheel without having to fumble with a separate connector.
A special tool is furnished to allow removal of the connector from the splined shaft to avoid damage to the connector caused by welding heat. Asymmetrical 20mm splines make it impossible to install the wheel incorrectly. The 5/8" diameter steel shaft gets welded to your steering shaft. Attaches to steering wheel with a 50mm three hole pattern using 10-32 bolts (furnished). FIA and SFI approved.