These are essential for safe use. Mine were broken when purchased with a new cutter. The retailer had trouble getting me replacements. So, I ordered direct and find out why they were having such a hard time. Payment was made at the time of order, but I received no communication on when I could expect these. Thank goodness the retailer had more pull and gave me replacements so I could use the new cutter I had sitting for two weeks. My order came at week five. I am keeping them for spares because they are pretty flimsy considering the job they do, and that they have to be pried by a screwdriver every time you need to grease the U-joints (every use).
