Petey (and others),
OK, here goes. I'll update this post later with more info and pictures. I'll have to keep it short for now. Mind my spelling.
1. Buy one Tikka XP and one star-mounted Seoul P4 led (AW will probably be selling these in a couple of days/weeks - check out his thread in the Sellers-section, otherwise you can buy a bare emitter and solder it onto a star yourself. I wouldn't recommend reusing the stock star).
2. Tools: You'll need a small torx-screwdriver (size=?) and a soldering iron
3. Turn the head of the light all the way up
4. Remove the backside (using your nails will do the trick)
5. Remove batteries
6. Unscrew the three small torx-screws on the backside of the light
7. Gently retract the light-electronics from the frontcover of the light (using a flat screewdriver if neccessary)
8. Remove the black plastic-cap from the LED-star (no tool required - this is where the optics-plate sits)
9. Unsolder the stock star (you'll have to use quite a lot of heat but eventually you'll get it)
10. Presolder the P4-star and the two wires
11. Solder the P4-star (remember to check for polarity first)
11b. You might have to put some thermal-grease on the backside where the heatdiode sits. I didn't since there was more than enough left on mine.
12. Place the black plasticcap on the P4-star
13. Gently replace the light-electronics back into the front-cover (remember to place the optics-plate into the black plastic cap first)
14. Screw the 3 torx-screws back in
15. Put batteries back in light
16. Replace backside of the light
17. Your good to go
AndreasB