Here’s the link to mod one and the parts you will need.
There’s a picture on here that I had found a long time ago of a mod that someone did that was a great idea. In chippermonkey’s guide, he states that you have to swap out the shaft of the ex2 with the Sanwa shaft.
In the mod that I saw you don’t. What you do is you grab the same attachment for the dremel that you used to file down the button tabs, and grind down the area of metal from the bottom plate that the shaft will be touching. If done correctly you will be able to screw the bottom plate back in and the joystick will be a perfect JLF.