Awesome! I just posted my first question and I might be able to answer one withing the same hour!
If it's riveted, you can use an angle grinder and grind the upper (section) side and punch it out with the knife placed over some chunk of metal with a hole in it (I use a huge nut on top of an anvil). Make sure you punch the centre with a thinner punch (as long as it can take the abuse) and give it a few good whacks to get it started, you don't want to spread it out instead of drive out. A lot of people say it's easier to grind the head off from the lower side of the knife, but this really depends how the rivets were installed. I always grind on the section side (upper) as this way you're not taking material off the knife bar, only the sections.
Alternatively, if you have a larger vise, you can lay the knife with the sections down in the vise, making sure the knife back is in contact with the vise jaws along the entire jaw length. Tighten the jaws only enough to lightly come up on the sections. You'll have have someone else holding the knife up to make sure it gets full contact along the vise. Make sure you're both wearing goggles and slam down on the rear end of the section (facing up in the vise). A little bit of the section sticks back behind the knife bar, so when you whack it it shears the rivets and drives the section off and down through the vise jaws while the knife back is still supported. This technique can be very fast, but you need two people. You also MUST make sure the knife bar is in contact with the vise jaws for the full width of the jaws. Otherwise you'll dent and slightly bend the knife and the section won't shear off.
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