What is SpaceFN and why you should give it a try
The SpaceFN concept - setting up your space key as a layer switch when held - is probably one of the most useful tweaks in the keyboard hobby. Let me explain how it works. My SpaceFN article on kbd.news made some rounds recently - quite surprisingly given the age of this concept. This piece you're reading is a condensed version of the full post. If you're left with unanswered questions, you'll most likely find the info you're looking for in the original write-up. On my imaginary top list of the most useful keyboard features, tweaks and hacks, SpaceFN would deserve a podium finish for sure. But what makes it so special? In short: SpaceFN is easy to implement, easy to learn, costs nothing, can be used with any keyboard, and can improve your productivity instantly. I will list its benefits below, but can state right at this point that the SpaceFN concept, setting up your space key as a layer switch when held, is clearly one of the most useful tweaks in the keyboard hobby....
Apr 30, 2024
From some cursory searching, it looks like the spacebar will use Cherry stabs (which are easier to deal with), and Costar stabs for the other long keys (which are more of a PITA). For Cherry stabs, I like to use two pullers until I get one side off, then carefully use my fingers (and puller as needed) to remove the other side.
Someone's post on Reddit about your KB: https://www.reddit.com/r/MechanicalKeyboards/comments/2cviig/review_das_keyboard_4_professional/
For dealing with the Costar stabs, this tutorial appears to be a good one: https://support.wasdkeyboards.com/hc/en-us/articles/115008742027-Removing-Cherry-MX-Keycaps
Just take your time :) Personally, I'm still awful and really slow at changing out keys on Costar stabs.