thanks Stuart, a thought I have already mulled over. The onlky tricky thing here is that I would need to get these screw cut, as it is a non standard thread, and it would be trickly, although not impossible, to hold these in the lathe. You can perhaps understand my desire to try to find some plugs as NOS. Will take a look at the diameter of oil drum plugs, but I think they are about 2 inch whereas the thread size is 2 5/8. thanks Andrew
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