From the Rock Shox service manual

MODEL / YEAR CROWN PRELOAD FORK BRACE ADJUSTER

’93 Quadra BLK,PRESSED ON HEX KEY BLACK ALUM

’94 Q10 PRESSED ON HEX KEY BLACK ALUM

’94 Q21 CLAMP ON HAND ADJUST BLACK ALUM

’95 Q5 PRESSED ON HEX KEY STAMPED STEEL/BLK ALUM

’95 Q21 PRESSED ON HAND ADJUST GRAY ALUM

’95 Q21R CLAMP ON HAND ADJUST YELLOW MAG

’96 Q5 PRESSED ON HAND ADJUST BLACK ALUM

’96 Q21R PRESS ON (OE), CLAMP ON (DI) HAND ADJUST YELLOW ALUM