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Sounds to me like the frame wasn't masked properly during the powder and oven process.
We specialise in masking products for exactly that purpose to avoid retapping threads and reworking material after finishing. http://www.afac.co.uk.Where did you get the work done? Perhaps we should contact them.
LFGSS
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Specialists in masking products for the metal finishing industries and custom silicone rubber mouldings