If it wasn't an emergency I would return it like the first time. The quality is good except for the main part, the thread at the end which is wound onto the factory tough fishing line. When I first tried them on a few months ago and couldn't wear them, I thought I had a defective set and returned it. This time I had a factory line cut and it was the quickest replacement I could get. Imagine my surprise when he too refused to hold on. Upon inspection I found that the threads had been damaged during the manufacturing process and the entry hole had been flattened to its maximum size and the threads were almost non-existent. Therefore, the factory screw connection did not stick and was not screwed in. As it was an emergency and could not be returned, I had to modify the hose by turning a hole to sand down the narrow spot and only then could I put it on. Shame on you Stoptech, I have your lines on my other two machines and they were perfect.