Metal Shaft

Are custom metal shaft lengths legal for 2023-24 VEX IQ Full Volume season?
I know they were legal in 2019-2020 squared away season under Rule ,
Are they made legal since 2019-20 or it was just limited to 2019-20 season?

Please review rule R15-a in the game manual. If you want to look at game manuals for previous seasons, too, you can find previous game manuals in the VIQC Hub.