Kraton JX Ecoboost 36kg servo horn problem

[joyykraton6s]

Hey guys. I have a V5 Kraton. I was just upgrading the servo to a jx ecoboost 36kg CLS6322HV servo. I've assembled most of it back but the stock spectrum servo horn doesn't seem to fit on the ecoboost servo. It's extremely tight, I've tried pushing it and even knocking on it gently with a spanner but it just doesn't seem to fit on. Has anyone had any experience with this?
Thanks

 

[Engineer]

Spektrum servos are 23T and I believe the JX (and most) servos are 25T - so you need to swap to a 25T servo horn.

 

[leroychurchill]

Purchase this https://www.amainhobbies.com/hot-ra...steering-w-25t-servo-arm-hraaon48sh25/p702009