The little plastic piece underneath the joystick that actually presses the switches.. wasn't sure if its called an actuator but I feel like ive heard that before. I am having some issues hitting diagonals when I need to, feels like im aiming slightly off and missing it. Or is there any modification I can do myself to ease the issue.
A little research tells me I may want to get the "white actuator" that the IL Eurosticks use, I cannot find them though.
As mgb stated, changing out the actuator won't help. Any actuator issues mentioned in old discussions found on the web have long been remedied. The current situation is that the stock switches have a somewhat low actuation point, which while making 4-way games more playable, reduces sensitivity for diagonals. If 4-way performance is less important to you than a larger diagonal zone, then replacement of the switches to some with a higher actuation point would likely be the answer. They may end up being more "clicky", depending on the switch (The IL version comes stock with some pretty stiff/loud ones, if memory serves me) but the diagonals should be more sensitive.
I am currently in discussion with HAPP about this, to see if there is something they can do with regard to their switch selection to increase the diagonal sensitivity, without going too far in degrading the 4-way performance. But it's a slow process, with many people involved. If that doesn't pan out, I'll look at sourcing some different switches on my own as an option.
The electrical tape mod will do the same thing, but may wear over time. Fine as a stop gap measure, but probably not a permanent solution.