Who has replaced a rear servo??

70aarcuda said
bricks go under bottle jack to get the jack high enough to work..then i use a large socket to hold spring and retainer in place while putting on snap ring

That works too. :D
So does AJ's method, and I actually used his way on the bench because it was faster.

A section of PVC, bottle of Jack with bricks and a socket :D, there's a few way of getting it done.