soldering and desoldering

Hello! I am in dire need of some assistance. I bought this old, functioning Marantz to try my hand at learning some restoration skills. Again, it was fully functional but could use some restoration. The spring-clip speaker terminals were a bit bust up, so I wanted to go ahead and try...

not sure if this is the ideal location for this "accumulation over time" thread but we shall see what happens. due to the various repair/diagnostic/forensic analysis items that go across the bench it seemed boring to create solo threads for everything. so... one thread with various hit & run...