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I used a similar rear spool design with the G&G spline shaft. I twisted the first shaft and had to upgrade to a heat treated one. Running a zx12. Id check to see if HT was done, Rick doesnt say on his site. Small price for the added durability. Upgrade looks great, looking like 10-12" added to length??
Cryo does not replace heat treating. It is an additional step . In your case (and 99% of all cases) HT is all that is needed. Best shaft material would be 8620 but 4340 is just fine also.