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I like where you went with this.
If you had to turn the compressor wheel because you couldn't find the washer size you needed, why not turn your own washer instead of the wheel? Seems like it may be easier.
How out of balance is the coupler? You might could possibly get it close enough in balance using an aircraft prop balancer or something.
Additionally you could use a coupler that uses a grub screw to secure the shafts, this might do a bit better of a job of being naturally balanced. (like the typical pinion gear does)
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