Modders don't want to buy a complete power supply to test out Slims. Instead of having 2 PHAT power supplies, just just your normal power supply and then plug in the adapter when you want to test out a slim. Cheaper, cleaner, and easier.
You should replace your laser lens if your system has the following problems:
Game Boy Advance Multi-Player Convertor !You still have an old GameBoy Pocket or Color link cable? You don't want to spend too much extra cash for a new cable? Here is the solution. Get this inexpensive Multi-Player Convertor to use your old GameBoy Pocket or Color link cables on the GameBoy Advance machine. For up to 4 player action.
Audio/Video cable 2M length! For PlayStation, PSone and PlayStation 2.