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My best friend (fifty years now) has a LHD Caterham 7, got it over a deade ago. The engine is a Kent block with a twin-cam Weber head. He's always had an issue with the throttle not returning all the way back to idle position. Had it to a shop up in Jax (where the guy has built a BUNCH of them) and they couldn't/didn't sort it. He trailered it up here from his place a couple hours south so we could try to solve the problem. Put a proper OEM Lotus return spring in it from my supplies, didn't totally fix the return issue. Pedal box next, the arc made by the pedal arm made a severe bend in the inner cable at the point where it met the outer's connection. 'MacGyvered' a 3/4" extension to it and the angle was straightened out, cable straight at full off position but that still didn't see fully closed throttle blades. Someplace in the cable there's enough friction to keep the spring from completely closing the blades. Light machine oil down the cable length didn't help. Now will have to find a replacement cable, as when the cable is out of the equation the spring works as designed. May try a home made cable using a bicycle brake one modified to fit. Perplexing! A one hour job turned into an all day head scratching session, didn't make it right but didn't make it worse at least! "Better" but not right.