So i decided to try making one, I used a semi-circular file and filed till it had the '999' combination. Here are the pictures:

Front View.

Back View.
The lock is a five-pin lock, so there have to be five peaks ( according to the helpful people in LP101

I wasn't expecting much when I was about to try. But i tried anyway, The first time i hit it, nothing happened. But the second time it worked!
And I managed to unlock the door ( It was a 'double-lock' door, so i had to do 2 successful bumps to open it)
My method was to put in the key, pull it out one notch and apply pressure in a clockwise direction, and just bump it(hard).

One more note: This key isn't really "bump-friendly" , look at the other end of the key, its sorta 'pointed', its quite difficult to bump it properly.
However, after trying for a few times, i realised the key became a little dented, but it was still able to go into the keyhole. I think i used too much force

Anyway, much thanks to the people in LP101.com , I used some of their tips and pointers to help me. Hahaha..