Well it is finally here. I must confess to something though, i opened my wii without the triwing, i kinda forced it

Everything still works but i have the wrong mod chip. (When i did the serial tracker it did not say my wii was GC2-D1) Here is the one i bought.
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My wii is pretty old. Heres what it says on the black board's...
GC2-D1
624P511E
Panasonic
GC2R-D2A
624U5MJ1
Japan
I was given this image by, Spyman, and i am very thankful for it. But i am kind of confused, how much i should cut? Does it matter what kind of knife i use? I just want to make sure because i payed a lot of money for my wii and my mod chip.
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Thank you very much!