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Hello. I have some of these that I machined up for the "Q" engine a few months ago. I drill the hole & tap it with a Whitworth thread just to give more area for the lead to stick to. I use old roofing lead melted in a bean tin. These plugs are very easy & quick to make. If you or anyone else needs one they would be £75.00 including postage. No V.A.T. Other styles, shapes & sizes I would gladly make if anyone is interested. Cheerio Michael Webber.