During my house move I used ratchet straps to secure a book-shelf on a roof of my car. That was well secured and worked out perfect. But the second time I have tried using the same straps, they did not want to release. After examination it turned out that the release mechanism got very tight and I could not rotate the drum backwards with hands. (I could on the new ones).
Also I spoke to my friend who works in Oil and Gas industry, offshore. He said that they discard the tie-downs after one use.
Surely I should not throw away ratchet strap tested for 800kg-load after securing with it a 20kg-book shelf for 10-minute journey on a car.
So the question is: should I just apply some WD-40 to the strap mechanism, try taking it apart and fix it. Or these things are really intended to be used once?