We're impressed with the One-Lock connection, and excited to offer this adapter for tool-free assembly of foils to your Cedrus Evolution mast. Thanks to Slingshot for providing the design files and ensuring a perfect fit with their foils. Due to the complex machining operations required to make this adapter, it's a bit more expensive than our typical adapters but cheaper than a whole fuselage and/or a new mast! We recommend a small piece of speed tape over the fastener tightening holes to further reduce drag; this can be as simple as thin packing tape.