Thank you everyone. Pretty clear now. I got the mechanic to do a 337. Turns out in the case of the flap rollers, the STC applies to the one “special...
Flying since 1968. CFI-A, CFI-I SEL. Have owned C172TD, T-Craft, Fleet 16B, Great Lakes, Comanche 250, J-3. Have flown extensively PA18A, CC 180, PT17 Stearman, WACO UBA. also instructed in C 152