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Hi i am having problems with my Minima , I’ve taken the boiler off and removed 4 of the bottom blanking bolts but the 5th one just wont budge and i have unfortunately rounded off the hex head inside the bolt, and i cant turn it anymore with an Allen key. I have purchased a Screw Remover and Extractor Set and will attempt to remove it that way. Hopefully i will remove the bolt but my question is where could i purchase a new bolt to fit the boiler, are they a universal fitting that i could purchase online .I contacted ACS and they said the plugs are ¼ thread and 8mm long