I want to make a simple robot arm like pic related but I'm having toruble finding servo's that are strong enough to support the arm when it's extended. The length of the arm in total is about 70cm when fully extended. the weight at the end of the arm is about 50 grams (vacuum pump that holds piece of paper)

Are there any servos you would recommend or any designs that I would be better of using? Iwas thinking of adding a counterweight or using springs to reduce the load.

The robot should be able to to go from touching its own base to extending up to 70 cm in the air.