Pfffffttt to the warranty and the party poopers. Modding your tool is fun and easy!
Own your tools.
To answer your question; yes those round things are a screw and bolt assembly that can be undone with two channel-locks. I recommend heating the tool for a few minutes before unscrewing them as they are sealed with locktite and are damaged easily.
Now, I was unable to find a common size at the hardware store to replace the screws but I may check some specialty stores this weekend.
Also, there are different size washers at different points on various tools. Make sure you pay attention when removing the tools from the handles.
I had to take apart my pawnshop PST to give it a through cleaning.
Here's a cheap Blast that I married to a Kick.
Here's the result. I love this tool now.
If you have any questions let me know. I've had a few of the newer tools apart (Kick, Blast) for modding purposes.
Now, there is a certain amount of overlap between Multi-tool companies. I currently working on a chart but, for example, some SOG implements fit Gerber tools, some Bear MGC implements fit Leatherman tools and so forth.