Agree with Colin. If a 3 armed lifter is above the mass then the servo will easily lift it. Small problem is the servo needs 3 connections, 5V, Gnd and signal. However, you may be able to use the body of the device as the ground connection.
Edit, by lifter I was thinking 3 bit's of wire twisted together at one end and bent under the "plate" at the other end so as to form a pyramid.
Edit2, go to your local model shop, buy servo, battery and servo tester and have a play. Probable <$30 all up.
Mike.