It is possible the Aixiz module is not right. I have seen them with the diode pocket not fully drilled out or threads missing and other quality control issues. It should not take excessive mechanacle pressure to get the diode in. If you need more than would be needed to use a pair of pliers. Also more than just the thermal issues when your diode is not completely counter sunk past flush you may have issues trying to use single element lenses like the G-1/G-2 as they have to get very close to the diode.
DTR, I tried pliers but when I press the plier screw just goes all the way down and makes the hole big.. Could it be my module? Is $50 gone then? I hooe my friends vice will work (even though it is a woodenn one).