Re: Repairing broken knobs.
They also make a thread repair kit here in the U.S. Called Helicoil (R) for repairing damaged threads. One drills out the hole a bit larger then inserts the Helicoil. Once it is in place, use the original screw.
That being said, more than once I have drilled the holes a bit larger and re-tapped them to use a bit larger Allen screw aka grub screw.
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