You can also buy SportStar's easier to use thumb screw. ChinStrap Adapter. Sold in sets of two (2) adapters.
SportStar Chinstrap Adapter for Riddell SpeedFlex
Riddell Speedflex Speed Flex Adult Varsity Football Helmet Size M/L 2020
riddell speed flex SPEEDFLEX ND6 Youth Facemask
Riddell SpeedFlex Speed Flex Facemask Black - SF-2BDC
Riddell SpeedFlex Football Helmet EMPTY SHELL ONLY - Youth Medium speed flex
Riddell Speedflex Speed Flex Varsity Football Helmet Size Small 2018
