I have been using Kawasaki connectors since 1983.
They are expensive! However, they have nothing to do with anything else, German or Italian, that I have tried.
Because of their high price, I conducted various tests with others and concluded that if you don't want to waste time and money, you must buy good products.
At first, after 5-6 years, it caused wear at the friction point of the mast with the balls of the quick connector.
Then an old craftsman told me to lubricate the friction point with a little oil 1-2 times a month.
Since then, I have really had these components, many of which work without any problems, for over 30 years!!!
WARNING
Stay away from cheap imitation Chinese ones, I tried them and they are really unsuitable even for amateur use.