Knex Predator Blades V 1.4

This is my latest blades from the avp and predator movies it is very sturdy but sometimes the mechanism fails so one of the blades cant come out. I will make a tutorial on how to make in the next 2 weeks but here it is...

Pros  
VERY strong and sturdy 
looks cool
ajustable sizes to fit your arm size
two blade mechanism 

Cons
no locking mechanism
sometimes the mechanism fails allowing one blade to come out