Step 1: You will need:

You will need:
Connectors:
Red / quarter - 7
Half moon - 9
Grey / two slot - 3
Tan clip - 1
Orange - 1
y clip - 1

Rods:
white - 11
grey - 1
blue - 1
green 1

other:
tape
string
joshqua says: Feb 17, 2013. 1:14 PM
this is great, but i modded the blue "trigger" to a white. The blue stands out to long under a sleeve.
patriots8888 says: Feb 13, 2012. 5:47 PM
inside the square it says well done
TigerNod says: Jun 8, 2011. 1:00 PM
Although it is nicely constructed, I do not advice anyone to use this; that includes you. You seem to have used bands to keep this knife in place, and those bands seem to wrap around your arm. Not kidding here, that's dangerous. That poses a serious health risk. Your blood stream may be cut off by the rubber bands around your arm. I suggest you immediatly stop using this hidden blade until you have found another way to attach it.
the master 2 (author) says: Jun 9, 2011. 8:06 AM
I have also just realised this risk for people using tight elastic bands. I suggest that you make a knex frame or tape on a toilet roll to attach the hidden blade.
TigerNod says: Jun 10, 2011. 11:48 AM
Yes, that would be better.
H1T4TCH1 says: Apr 7, 2011. 12:49 PM
'Well done!!!!!'

Thanks ;-)
fairyqueen2010 says: Apr 4, 2011. 12:10 PM
well i think its cool, i can tell you really worked hard "the master2"
greenguy421 says: Apr 4, 2011. 7:57 AM
wow. this is awesome
keir111113 says: Apr 4, 2011. 11:26 AM
I agree. the master 2 is great
keir111114 says: Apr 4, 2011. 11:30 AM
Hey! Great instructable. Works well.
knex_builder_freak says: Mar 29, 2011. 3:21 PM
"Well done!!!!!" is inside :-P

It's not that bad, but you could work on it a bit :-)
the master 2 (author) says: Mar 30, 2011. 8:26 AM
what could I improve?
knex_builder_freak says: Mar 30, 2011. 12:55 PM
I'm not sure, but the only thing that I say is really on the not so good side is that the arm wraps are rubber bands, but that's just me.
~KGB~ says: Mar 29, 2011. 2:59 PM
meh
the master 2 (author) says: Mar 30, 2011. 8:27 AM
what do you mean 'meh' ?
~KGB~ says: Mar 30, 2011. 8:34 AM
its a bit basic...
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