The bore on the cover isn't "fixable" it is the case itself that the shaft rubs against . A new cover is the only real option as there isn't enough material to bore and install a bushing . I don't know where your located but I have a pile of parts that I should be able to come up with a tighter set for not much .
If the inner bore in the center case is badly worn from the outer case being so loose it will cause faster wear on a new cover, to a point. The 2 bores are the support for the shaft and work together to keep the shifter shaft straight , when one is worn it puts more wear on the other . A new inner case is the fix to that , which is basically the bottom end and both case halves should be replaced as a matched pair . I think that one could be bored ot a little and a custom bushing made .
The idler gear that is driven by the kicker , how is that fitting on its shaft ? I have made new bushings for 2 of them to make them nice and snug , they tend to bind when worn and cause more pressure on the kicker shaft, thus the bores.
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