To repair external threads, you need a thread file or the right die. Without all this, however, a slotted nut can help.
Because threads are screwed up by non-expert personnel faster than the IS stormtroopers level Palmyra, you should always have a tap in your pocket. Or a thread file or a small triangular file. Or a new screw/bolt/threaded rod – that’s the pious wish when you’re squatting in the desert sand in front of broken material and there’s no screw store nearby.
In the “jungle repairs” department, it is therefore a good idea to simply slit a normal (and suitable) nut with a saw and turn it with all due caution and sacred respect for the last chance at the fouled thread.
The burr on the saw cut acts as a cutting tool, at least briefly, and may be the last chance to get the thread going again. For optimum rescue performance, use the hardest possible nut, i.e. 12.9 is better than 8.8. and apply the saw cut at an angle.
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