Hi John I have several 1" BSP taps I will have a look tomorrow as I am not sure whether they are taper or not do you know how much oversize you need ? I know when I served my time you can get taps to cut oversize using a simple solution however I do not know if it works on all sizes as we used them only on taps up to 3/4" .I will post tomorrow if I can help.Regards Ernest.
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