On 8 Dec 2004 11:20:06 -0800, in a place far, far away, "Explorer"
made the phosphor on my monitor glow in such
a way as to indicate that:

Better to hold onto existing hardware until the replacement is on
orbit. So, we really need that robot to save Hubble!

No, we don't. It can be done with a Shuttle flight much more cost
effectively.