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If the bore of the housing is within specification and the shaft bolt correctly tightened there are two reasons why a shaft could walk out the carrier.
The first is that the shaft has been made too small and that there is insufficient expansion to make it grip correctly in the housing.
The second is that the wall thickness at the end of the shaft is too large so that the expansion is too low to allow the shaft too grip.
The small shaft would increase the clearance in the bush and this may affect lubrication but as these bushes tend to operate in a 'mixed-mode' this seems an unlikely reason for accelerated wear of the type shown.
If the shaft is the correct size then the clearance in a Permaglide/DU type bush may be too low and this would certainly accelerate wear of the PFTE/bronze layer and would result in a more general wear.
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