Hey Axel
Welcome to the forum!!!
Chief's right!!!
The more metal you have on your bird the more plastic inside can and probably will break or strip. I have installed a CNC Esky kit that I bought from a guy on eBay. It contained all of the head assembly and tail assembly. I've had crashes using both plastic and CNC and the CNC always seemed to do more damage to stuff because it was alot stronger than the other parts originally put in by factory.
If you know what you're doing the CNC upgrade seems to make flight smoother (IMO anyway) and it seems easier to maintain and service to me. It seemed that the heli responded better to me too. Here's a link to the set that I bought. It was $17 or so + shipping from China.
Esky Upgrade KitThe only problem that I had with the set was that it took two weeks for me to get it. I'm sometimes impatient when I want to do things. LOL !!!
It is just the stock Esky kit, but contains all the head and tail pieces. You will have to assemble the kit yourself. The CNC kit does require a special feathering or spindle shaft. If you buy from that guy on eBay, the kit will contain two so you will have at least one spare. The stock feathering shafts won't work because the new ones are longer. There are other kits out there. Just do your homework so you don't get
!!!!!
I've crashed three times with the CNC kit (faulty ESC once, and poor judgement while inverted on the other two. . . .LOL) It held up very well, but a lot of plastic control rods I never used to have problems with broke and I've stripped two servos crashing with the CNC. CNC stuff didn't even have a scratch though. Didn't mind the crashes either, because I learned my lesson and the CNC add ons proved theselves. I love building and tearing apart stuff too so that's half the fun!!! LOL.
Set up with this kit is not hard and if you know how to replace your main and tail shaft it will be a breeze. There should be detailed instructions in your owner's manual for the CP though on how to install the upgrades.
I've never bought anything from helibuy.com so I'm not speaking from experience, but a friend of mine bought something there and got something completely different than he ordered three times and finally just asked for a refund. Don't know if they were having a bad couple weeks or what, because I know other people that had no problems getting stuff from there.
Hope this helps!