RE: old servo made new?
By all means test them!! I even test new servos right out of the box these days. I get a lot of plugs from old servos, switches and Y harness and extensions.. I just clip them off and solder them onto the servos and cover the soldered section with heat shrink tubes. I even have some of the old servo extensions with the old plug style on one end and the newer type on the other. I guess I need to get out there and toss so of the old stuff I have.