How To Rebuild a Shimano 105 5600/5700/5701 Derailleur

Thanks to Silicon Valley Bicycle Exchange for lending me this derailleur!
bikex.org/
Ignore this: Rebuild Service Disassembly Assembly Fix Restore Regrease Repair Refurbish Overhaul Clean

[@el_carbonara]

lifesaver, servicing one right now

[@AnteUp34]

Mine still has play when I bolt it up to the derailleur hanger. What does this mean? Can it be serviced?

[@XavierMainaGitonga]

What size was the b spring allen key? Kindly

[@el_carbonara]

2mm

[@peterdcrees]

that's the p-spring