Holmes One piece garage door spring P720

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Help, Troubleshooting, and Instructions

Holmes P720 garage door spring with the C hook attached

"A" Length Over Coils "B" Outside Dia. "C" Type of Ends "D" Wire Dia. & Gauge Initial Tension ** Max. Allowable Stretch (Inch.)

20" 1 5/16" PLUG (.177) #7 110 - 120 16