Not sure what you mean by “shaft graduations”. The FST 90 is a combination flex A/R that can be trimmed for either A flex or R flex. The trim code for the A is IR20 and for an R flex is IR3. The trim code chart can be found at the link below:
https://store-k9nvqai7wz.mybigcommerce.com/content/description/shaft_trim_inst.pdf
Britt Lindsey