Driver shaft change Stiff to Regular ??

[RRidges]

You are right Miyazaki is part of Srixon. The first part of Srixon being Sumitomo Rubber Industries I have never known what the last part stands for.

I don't think the 'xon' means anything other than something to finish a word that has 'Sri' at the start. Probably chosen from a bunch of staff suggestions.