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bushings made at machine shop is your best bet. Tell them its gonna be under serious abuse and get the toughest metal (or steel alloy) they have. You dodnt want brittle though, it should have some spring to it. Kinda like titanium. Titanium is bouncy (IN THIN SHEET). Titanium alloy isnt too bad price wise, pure titanium would be far too expensive and I dont think as good for this as alloy. Im thinking of getting some for our bushings we will have to replace eventually. Make sure your machine shop is willing to work with it first. If not steel with high carbon maybe your next best bet. Link "Titanium and titanium alloys are non-ferrous metals with excellent corrosion resistance, fatigue properties, and high strength-to-weight ratios. Products differ in terms of composition, grade, shape, dimensions, and features. Commercially pure, unalloyed or very low alloy titanium does not contain or contains only very small amounts of alloying elements. By contrast, titanium alloys contain significant amounts of added elements or constituents. Clad or bimetal titanium alloys consist of two different alloys that are bonded integrally together. Metal matrix composites have a composite or reinforced metal or alloy matrix filled with a second component, which may be in particulate, chopped fiber, continuous filament, or fabric form. Other unlisted, specialty or proprietary titanium and titanium alloys are also available. These materials are often based on a unique alloy system, use a novel processing technology, or have properties tailored for specific applications." Titanium Alloy Types and applications
http://www.allvac.com/pages/Titanium/Default.htm
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