I've used the Seasense spinner on my boat for 10 years and am very pleased with it. This knob might be suitable for your use.
[ame=http://www.amazon.com/Seasense-Stainless-Steel-Turning-Steering/dp/B004XAJKWC]Amazon.com : Seasense Stainless Steel Turning Knob For Steering Wheel : Boating Steering Wheels : Sports & Outdoors[/ame]
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