![](../art/day4/wfpc2-3-100.jpg)
Drew Feustal contemplates a stuck bolt
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John Grunsfeld hangs on the side of Hubble while waiting for word from Mission Control regarding the stuck bolt
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John Grunsfeld reflected in Hubble views WFPC2 with attached Handle
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![](../art/day4/wfpc2-8-100.jpg)
Finally the stuck bolt is lossened
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![](../art/day4/wfpc2-10-100.jpg)
Drew Feustal starts to pull to remove WFPC2
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![](../art/day4/wfpc2-11-100.jpg)
WFPC2 is removed inch by inch
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WFPC2 is removed inch by inch
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WFPC2 almost out
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WFPC2 clears the bay cavity
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John Grunsfeld looks inside the WFC cavity
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Drew Feustal riding the robotic arm moves WFPC2 to the side
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![](../art/day4/wfpc2-20-100.jpg)
Drew Feustal riding the robotic arm moves WFPC2 to the side
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![](../art/day4/wfpc2-22-100.jpg)
Drew Feustal parks WFPC2 on the side of Atlantis' bay
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![](../art/day4/wfpc2-30-100.jpg)
WFPC2, the Camera that saved Hubble, is parked on the side of Atlantis' bay while the astronauts install WFC3
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![](../art/day4/wfc3-1-100.jpg)
Drew Feustal (on robotic arm) with assistance from John Grunsfeld begins WFC3 insertion
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WFC3 being inserted
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![](../art/day4/wfc3-3-100.jpg)
WFC3, just a little more
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![](../art/day4/wfc3-5-100.jpg)
WFC3 is installed
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![](../art/day4/wfc3-6-100.jpg)
John Grunsfeld (top) and Drew Feustal complete installation of WFC3
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![](../art/day4/wfc3-14-100.jpg)
WFPC2 is placed in the SIPE for the return trip home
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![](../art/day4/wfc3-19-100.jpg)
John Grunsfeld and Drew Feustal secure WFPC2 in the SIPE
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![](../art/day4/wfc3-20-100.jpg)
John Grunsfeld and Drew Feustal Clean up following the WFC swap and prepare for the next task
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![](../art/day4/sicdh-5-100.jpg)
John Grunsfeld using the pistol grip tool (PGT) prepares to release the bolts holding the Bay 10 doors
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![](../art/day4/sicdh-3-100.jpg)
In the mean time, Drew Feustal removes the replacement SIC&DH from the MULE
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![](../art/day4/sicdh-10-100.jpg)
John Grunsfeld opens the Bay 10 door revealing the SIC&DH
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![](../art/day4/sicdh-17-100.jpg)
John Grunsfeld lubracates door latches. Visible on his wrist is the task flip cards, similar to what NFL quarterback use on the field to call plays
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![](../art/day4/sicdh-20-100.jpg)
John Grunsfeld installs a LOCK for faster opening and closing of the telescope doors (-V2) during the 3rd spacewalk
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![](../art/day4/sicdh-23-100.jpg)
With all tasks complete, John Grunsfeld and Drew Feustal prepare to head back to the airlock
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