Removing Mirrors:

• Measure angle of wiffle tree of mirror to be removed on truss
• Move dome and crane to attach lifting fixture
• Check bolts on lifting fixture to make sure threads are ok
• Attach lifting fixture to hoist and set lengths of straps
• Move hoist up and position dome to put lifting fixture into place
• Lower hoist so lifting fixture is just above mirror to be removed
• Put radial strap in middle hole in wiffle tree
• 
• Attach radial ratchet and put some load on wiffle tree (mark position of strap attachment)
• INSTALL EDGE PROTECTORS
• Leave safety bracket on
• Tap/clean wiffle tree attach points
• Replace M30’s with jackscrews(make sure screws are lubricated) starting with top and ending with the one that is toward the center of the array
• Loosen all safeties, 3 large bolts as well as 6 screws holding brackets
• Start jacking mirror, moving all jack screws equal amounts
• WATCH EDGES
• Make sure gapes are ok as well as keeping all jackscrews loose enough to turn by hand by adjusting radial ratchet
• CONTINUE ON BACKSIDE
• Remove edge protectors when mirror about 1/2" above surrounding mirrors
• Move mirror high enough and attach lifting fixture clamps
• Load hoist
• Remove 1/4-20 screws attached to wiffle tree, starting on top, then bottom outside and last bottom inside(TOI)
• Lower jack screws
• Remove radial ratchet strap while holding wiffle tree
• While holding wiffle tree run hoist up fast, watching to make sure mirror doesn’t swing into anything, particularly mirrors
• Hoist mirror up, out and set on cart
• Remove spherical washers if mirror not being immediately being reinstalled

• Make sure safety brackets and safety wires are installed
• Position telescope and dome, position crane, lower hoist, attach lifting fixture to wiffle tree and set strap lengths or angles
• Lift mirror and move into place by whatever means necessary
• Install jackscrews and set to proper height
• Put spherical washers on end of jackscrews
• Move mirror down until it contacts one of the jackscrews, determine if gaps correct
• Attach 1/4-20’s to wiffle tree, top first not tight, outer then inner 1/4-20’s
• If necessary move jackscrews up to touch wiffle tree
• Tighten 1/4-20’s
• Attach radial ratchet strap and load until jackscrews move up slightly radially
• Lower hoist, remove lifting fixture clamp, holding until hoist is run up, watching to make sure nothing contacts mirrors
• Remove bottom 2 metric safety bolts from truss
• Start lowering jackscrews in sync, watching gap and adjust radial ratchet to maintain adequate gap
• INSTALL EDGE PROTECTORS when edge protectors about 1/2" above surrounding mirrors
• Move all the way down to the truss, making sure top safety clip positioned properly
• Install two lower safety bolts
• CONTINUED ON BACKSIDE
• Make sure lower 1/4-20’s are tight
• Make sure radial ratchet is tight
• Adjust mirror gaps
• Start removing top 1/4-20, if wiffle tree starts moving away from truss tighten radial ratchet more
• Remove top jackscrew and install M30
• Tighten 1/4-20 to proper torque
• Remove outer jackscrew and install M30 and tighten 1/4-20 to proper torque
• Remove inner jackscrew, install M30 and tighten 1/4-20 to proper torque
• Make sure gap roughly equal around edge of mirror, if not, adjust by loosening 2 of the 1/4-20’s at a time and shifting mirror, BE CAREFUL
• After each shift, retighten 1/4-20’s to proper torque
• After centering tighten 1/4-20’s to proper torque and tighten safety brackets and bolts
• Remove radial ratchet
• Remove edge protectors
• Move hoist / crane up and out
• Collect all tools
• Remove handling fixture and stow hoist / crane

Tools Required

#1 Strap to attach radial ratchet to truss

#2 Spray bottle for edge protectors suction cups

#3 Mirror edge protectors

#4 Lubricant for jack screws

#5 Radial ratchet

#6 T-handle 3/16" hex key for 1/4-20 allen screws

#7 T-handle 6mm hex key for safety screws

#8 5/32" hex key driver for safety brackets

#9 T wrench for M-30’s

#10 Ratchet tap handle with 3/8-16 for cleaning wiffle tree attachment points

#11 3/8-16 die and handle for cleaning lifting fixture attachment screws

#12 Large screw driver to be used as pry bar

#13 Torque wrench for tightening 1/4-20 screws in M-30’s

#14 Jack screw in M-30 bushing

#15 Rope for lifting tool bucket into truss

#16 Strap to attach radial ratchet to wiffle tree