Kraton Kraton 4s v2.5 - servo arm hack

[Barmaleus]

Hey all,

If you need a new servo arm for your K4s v2.5, here is an easy and cheap solution.

1. Get a Tra**as 2742X set (~5 eur).
2. Get an M3 grub screw 10-12mm.
3. Measure and cut two rod ends from the set so that together they are the same as the original servo arm.
4. Connect the rod ends with the grub screw.
5. Take the balls (not yours, but ones from the 2742X set) and Dremel or something.
6. Remove the top and bottom material from the balls so that the height is around 4.90mm (this is the height of a new, original ball according to my measurements which may not be ideal). You might need to trim more, but make a test fit first (assemble the whole steering block).
7. Experiment further to fit as needed.

Result: for 5 eur (got the grub screw for free) I am getting three servo arms with metal balls. Needs tinkering, but that's fine.

 

[MrTitanium]

I bought a few of these. Zero issues.

https://www.aliexpress.com/item/100....order_list.order_list_main.34.314418026awLV8

 

[Barmaleus]

I bought a few of these. Zero issues.

Looks nice! Are the dimensions identical to stock (K4s v2)? Perhaps you have one somewhere nearby to take measurements? Interested to see

 

[Dan B.]

I bought a few of these. Zero issues.

https://www.aliexpress.com/item/100....order_list.order_list_main.34.314418026awLV8

View attachment 362433

That makes more sense all the way around, as long as you can spare two or three weeks.

 

[MrTitanium]

The 3s/4s line all share the same link center-to-center.

https://www.arrma-rc.com/en/product/steering-parts-set/ARA340179.html

 

[pierre1111]

Hot racing has one with their servo saver. Not sure if they sell it separately.

 

[Barmaleus]

The 3s/4s line all share the same link center-to-center.

https://www.arrma-rc.com/en/product/steering-parts-set/ARA340179.html

Understood, nice. I'll try one of these too. Thanks for a link!

Hot racing has one with their servo saver. Not sure if they sell it separately.

Haven't found it separately, nope