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Hi MJM. I have just thought that I could have made the oval parts oval before I inserted them before I silver soldered them >>> we live and learn I suppose ?!!! this pulley is actually quite hidden from view behind the eccentrics and I could make another one to get it perfect rather than looking like a poor casting !!! I have had to guesstimate the actual dimensions as we can't visit the engine as we are in lockdown and I don't have any really good photos of it !!Willy