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Nathan Foster

Hi Bryan, the common name for this thread pitch is 1/4" UNF (1/4" x 28). If there has been some cross threading (perhaps compound seeped into the threads), it may pay to obtain a thread tap and wind this in by hand to clean up the threads. If you need new screws, these will ship from the U.S (Midway / Brownells) to Ireland without restrictions. But you may also be able to find 1/4" UNF hex heads locally.