I have a 1960s English wood machine I'm restoring . All BSW / Whitworth threads . The fit of the bolts through cast iron and other metals is nice and fine . Not a sloppy fit .

I tried using a Whitworth tap through one of the dirty holes to clean it out and it shaved enough away to loosen that fine fit . I only did that once !

Some other damaged threads I had to do anyway to get them working again . No other option .


What are the options with this situation ?

Do you find a Whitworth tap and die set that happens to match buy buying a few and trying ? Do they differ between makes ?

Or in the past did the sets come in various fits?

Or is that just the way it goes and you try not to do it unless necessary ?

Thanks. Rob


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