try this. Use a jumper wire with alligator clips to jump the EOS Switch closed. If the flippers are strong then the switch is the problem. If this is not the problem then the coils are suspect. Don't leave the jumper on as you can burn the coil by holding it on.

You want the EOS switch to stay closed as long as possible before coming completely open. VID1900 has a great topic on rebuilding and adjusting flippers.

it might be hard to get you a pic from those machines but they are mostly all wired the same. Here's a diagram online:
http://www.pinrepair.com/em/flip1.gif

You have 2 wires of matching colors going to the outer lug with the thicker coil winding wire. The middle lug is wired to the EOS switch. The other outer lug will have a wire from the switch and another colored wire.

Flip Flop has upper flippers right? If there are 2 switches in a stack on the lower flipper one is the end of stroke and the other controls the upper flipper on the same side.

Did you try the jumper to eliminate the EOS? Keep in mind that an EOS problem is likely adjustment and not the switch. You want the strong winding to stay on as long as possible for a strong flip but to cut off at the last second to prevent burning the coil. Vid's guide is the reference for how to adjust them