OK, here's the issue:

I removed the original Upper & Lower Blades from my E-Flite Blade CX3 and replaced them with some after market blades. I have destroyed the after market blades and wish to refit the original blades BUT have noticed that they have a different part number stamped into the blade.

I don't have the blades right in front of me as I type this new thread but from memory one set is stamped as A4 and the other set is stamped as B3 (I stand to be corrected )

Could someone please let me know in which position I need to put each blade set, in other words which part number goes where.

I await your kind replies...

The blades marked "A" are your top blades. The blades marked "B" are your bottom blades Pay no attention to the numbers. You may also want to balance those blades too. Click on my user name for a tutorial on balancing blades. You only need a spare blade grip. It's ok to steal the top blade grip to get the job done though.

Mike.

Many thanks Chap1012!

Read your tutorial on Blade Balancing Blades, thank you again.

All the best...

No prob....happy flying

Come jaw a little on the CX2 thread. There isn't a heck of a lot of difference between the CX2 and the CX3. The heli wants pivoting blade grips so you have a better selection of after market blades. The stock ones break if you look at them funny and there are many blades to choose from once you have the pivoting grips.
What does the E-Flite Blade MD-520N mean? Did you change the canopy or is there an Eflite heli with that name?