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I had the ones with the nylon pieces and they both shattered over the course of time. I thought the type with the springs were a heavier duty type used on larger windows (Lincoln?) and had a bit of trouble sourcing them. Since I installed them 2 or 3 years ago, those problems have disappeared.
I must add that I have the windows on fresh power fed by relays now, so they move quickly, but the spring type clutches have worked well. The biggest problem I have found is alignment and positioning of the window/motor housing so that the rollers don't run too high in the track. Once the roller gets right to the top, the geometry is wrong for the motor to begin to easily push the widow back up.
Terry
64HT
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