This is why some break screws off. The screws are not supposed to be torqued down. They have Loctite on the threads. Just make them touch and stop. Thats why they say use new screws.
This one I have does two batteries at a time in 35minutes. He has others that do same in different configs. This PD power adapter works great. Only gets 110°F after prolonged use. The two batteries charged at the same time barely reach 90°F.