In order to defend against handblading you can change the factory acetal bush to a sintered bronze bush. Sintered bronze bushes in this size tend to have the incorrect dimensions.
The Oiles Drymet LFF bushing series LFF-0605 is a suitable replacement but is 2mm too long.
To account for this you can either trim the bushing to size (~3mm height desirable) using a die grinder or just with a grinding wheel.
Alternatively you can remove the factory OEM washer and install a shim washer between the bush and bracket that is 2mm tall, 8mm ID.