I have been using these for a while now: -
https://www.modelsport.co.uk/alturn-...roducts/359785
I have 5 of these now and have been using them for 4 years. I did have one failure as the result of a big 'off track excursion'
but they are so cheap they are almost disposable. I have had premium servos in the past (and they also work fine) but this route has worked for me and at my driving ability I see no major advantage of the more expensive stuff.