thanks for clarifying.

The design for that bushing and shaft in the IP timing gear was updated to provide better lubrication in that area... at least for the 617 models. I imagine, if you are looking for used parts, that you may want find later model 616 / 617 more desirable. There is a very good chance that this part is the same for both models, since the I am lead to believe the timing gear is.

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