Hotchkis 19445 Scion FRS, Subaru BRZ Sport Coil Springs - Manual (Page 13)

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15F. Compress the coil with the spring compressor. It is imperative that the top metal perch sets into shaft
properly. Install the bearing hat.
Tighten the strut shaft nut in the same manner as removal. (17mm pass through wrench & 6mm allen key)