I didn't lock tight mine. Just cranked em tight after cleaning.
Keeping the impellers in the same relationship is key. I used a scribe mark.
Best regards,
Michael
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Michael 
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS
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