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The chain guide bed rails from Ziegelmeyer have hardened caps that can be replaced. Other systems must be replaced when the top shows wear. Western systems have the chain running steel against steel. When wear occurs the whole bed must be replaced. On the Ziegelmeyer conversion the bed is protected by a UHMW wear strip between the chain and the bed. The bed will never wear out and the guide rails can be switched right to left and left to right when wear occurs and ran again. This gives the Ziegelmeyer system twice the life of the standard western type chain guide system.