I strongly recommend these TiNi Shock shafts if you ever bent one of your TEKNO stock shock shafts. It is a bit more expensive than the stock one but it is much stronger and smoother. You need to have the clamp tool to make sure you do not scratch these when you install them.
If you want to make the smoothest shocks out there even better, add these shafts and the delrin guides. I've done both on both my et48.3 and sct410.3 and they have the best shocks I've ever owned in 25 years of building top end rc vehicles..