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Uh-Oh. See my previous post. It sounds like there is not enough clearance between the worms and the gears in the trucks. You need to shim the motor up slightly to prevent the worms from binding. Mike

I don't know that there is a generic "problem". It is just that the Life-Like worms are plastic, and they don't run as true as machined brass worms. Mathieu didn't say what originally caused his "problem", just that he needed help retrofitting the Kato brass worms. The only problems I have...

Here is how... I have done 8 of these. It is not too difficult; just use some care. It helps to have the right tools. I finally bought a NorthWest Short Lines SensiPress. It is the perfect tool for this task. You can also improvise. You need to make a jig on which to press the brass worm off...