When the time comes to retire the K5000's, consider the K1100 Plus. They are lighter, have more studs, and no threads. You bang the studs in and out with a Korker punch tool.
On my old 5000's, I didn't apply the good advice you are getting above and ended up loosing a few thread sockets on each sole. So I was forced to look for a new pair. Talking around, I got the impression that the K5000 originated from a design intended for the roofing industry. Being annoyed with the rust and loosing thread sockets, I gobbled up the 1100's and have been very pleased.
If you didn't loose any thread sockets on the 5000's yet, apply the goo mentioned above above and you should be all set.
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