Hi poeee,
Look like the exact setup I put in my clubby (except mine isn't boosted).
The easiest way to dismantle the bias valve is to place it lengthwise in a vise, and squeeze it until the sheet metal cap (the one opposite the screw-on end) is pushed inwards just a little way. Using a screwdriver, you can then bend back the little metal tabs that hold it on. Then just loosen off the vise, and the sheet metal cap can come off.
It's a little funny, because one end is a screw on end, and the other not, but they both need to come off.
Once the metal end is off, you can take out the spring, and if you look down the hole, there is a nut holding the plunger in. The plunger is what you called the '(plastic??) thing inside it.' Use a socket to remove this, and then slide the plunger out the other end (the threaded end).
And that's it, as far as I know. There is a little spring-loaded square bar that goes into the end of the plunger (which you should have already seen if you unscrewed the end. You can take the little bar out with your fingers, but I couldn't see any way of dismatling the plunger any further.
I fitted some new o-rings, gave it a clean and reassembled. Works a treat.
Now, if you have the stepped bore MC (yellow tag, I'm not sure about the others) you will need to swap the lines out. The top outlet has a smaller bore, meaning higher pressure, so this will need to go to the front lines (i.e the lines will swap from what you have drawn in the diagram).
With the built in booster (green tag?) you will need to check if it has a stepped bore. If it does, you will need to swap the lines (because I don't think you can have the bigger bore at the top, can you?).
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