I am not sure what you're describing. Double K's are by far the best clippers I've ever used, also the techs I ask say they are the strongest though yeah, they are cumbersome, the motor makes them the strongest ones....
so I ask are you sure you're getting the blades to lock in properly?
Another thing that a service tech told me is NOT to clamp them down when the motor is running, rather to click them into place when it's off and then when you turn them on very slowly, apply gentle pressure and the lever will find its proper seat. If you clamp them down when it's running fast, it will eventually bend the blade clips outward and make your blades track even when they are sharpened.
There should be a positive "click" as they lock into place and there's no amount of slop (ideally). Not sure how long you've had them, but the lever is easy to change out and it usually needs replacing after about ten or fifteen horse clips, IME.
If you can show pictures of what you're having trouble with, it might help. Many showers and breeders have been using these a long time and might be able to help in person if you're near someone. I doubt they're worthy of the trash, though if you're tossing 'em out, I'll take them, I could use a second set! *LOL*
Liz M.
