Background The stairlift application is a difficult one for overmolded rollers. The stairlift chair steel guide rail, needs to have high quality rollers to support heavy loads, at a high offset moment, and on inclined stairs up to 52 degrees. • The roller can rest in the same position for a long time, and the roller polymer must not “flat spot”. • The equivalent of 10 years service life, at maximum load and stair incline is the project objec

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