I've got one of these off ebay and its got a small shaft!!
Took a chance and ordered one the other day as it was only just over £4 and worth the risk! Not expecting much but had some surprisingly good results with the cheaper turnigy stuff.
http://www.hobbyking.com/hobbyking/s...arehouse_.html
Seems to be well made, fits nicely in the car and can use existing servo mounts which is a bonus!
I presume/hope the M18 servo saver fits the smaller shaft servos? Will order one today if it does.
Again, thanx for the advice