Re: Drilling Tufnol
All good advice Andy.
The only comment I will add is if you do use a hole saw once you've drilled the pilot hole replace the pilot drill with a piece of steel of the same diameter.
The shanks of pilot drills are often not of good quality, can be of odd sizes and the flutes can extend to be level with the teeth of the hole saw and cause a lot of wobble.
Practice first on a piece of scrap.
Jim
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