Mueller Roll-Up Door W300 - Manual (Page 11)

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1 x 3/8˝
Carriage Bolt
3/8˝ Washer
3/8˝
Lock Nut
Headstop Bar
Door
Jamb
Guide
STEP 13: SETTING SPRING INITIAL TENSION
Rotate door two revolutions, rotating the top of the
door towards the opening.
NOTE: If your building design does not allow
for door rotation, lower the door curtain into the
guides and follow the instructions in Step 16 to set
door tension.