Greeting: In the absence of someone more knowledgeable I will share my highly limited experience in disassembling this type of knife.
I have an Black G-10 UK Penknife. As you wisely noted this type of design, basically a slip joint with screw type construction, can be INTERESTING (pain in the ass) to reassemble without burring up the screw threads. There are probably many ways to successfully deal with disassembly/assembly of this type of "Slipit" knife however this is what worked for me. Place knife on a non-skid surface. Loosen but do not remove pivot screw. Loosen and remove Torx screw furthest from pivot. Loosen and remove middle screw. Remove pivot screw. You will see and feel the back spring relax and shift position. Reassembly is in reverse order BUT you must re-tension the back spring BEFORE reinstalling the last screw, (the one furthest from the pivot). You must align the holes in the scales with the holes in the back spring while it is under tension. If not, the back spring and scale screw holes will not align properly which may result in at least partially stripping the screw threads . I used a cut down tongue depressor/popsicle stick inserted between the scales pressed hard against the rear most portion of the back spring while holding the back of the knife. Hold against the back spring pressure keeping it tensioned in until the holes are aligned. Do this while finessing the last screw back in. Feel free to curse quietly during this process. It may take some patience. You may wish to put a thin strip of cardboard against the inside of the back spring to protect the NEW blade edge from hitting the spring BEFORE you close it the first time. If the NEW blade's kick does not seat high enough (remember it is a transplant) the blade edge may hit the spring when closing resulting in some additional cursing. -- OldDude1
