I've used the Rewa LM-40 for the iPhone back replacement : https://hexcs.com/phone-repairs/apple-iphone-repairs/glass-back-cover-replacement/ . Unfortunately it failed just after about 30 backs replacements which is disappointing. It looks like the laster got decalibrated and it is not precise. I'm dealing with Rewa to see if it is able to be rectified by means of calibration or something.