A damaged thread is either cleaned up or replaced, and which of the two is possible decides everything else. If the thread form is still there under the damage, restoring chases it back into shape. If the thread has been stripped out, no amount of chasing will bring it back and an insert is the only route. Deciding which of the two applies takes a moment and saves buying the wrong kit entirely.
Restoring tools work along the existing thread. A restoring file has several pitches cut into it and is drawn along the damaged thread by hand. An adjustable restorer covers M4 to M45 in one tool by clamping round the shaft, which suits a workshop meeting many sizes rather than one.
Re-threader kits cut the thread again with a die or a tap rather than filing it. The 15 piece metric kit covers common sizes and the 42 piece master kit adds NF and NC taps and dies for imperial work. This is chasing rather than cutting new, so the original size is kept. Draper hold a combination tap and die set in metric and BSP in an EVA foam tray for the same work.
Insert kits replace the thread entirely, drilling out the damage, tapping oversize and fitting a lined insert that restores the original thread size. Kits are held at M10 x 1.5mm, M12 x 1.75mm and M14 x 1.25mm, and the pitch has to match the fastener as well as the diameter. Questions go over WhatsApp on 07754288583.
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