[jimmy]

nah
play doesn't really matter that much - you can use them if you want but it's not needed.

The outdrive springs are made only for the one-way diff outdrives - they stop the outdrives moving outward which can lock up the suspension and/or break drive shafts - not good, I did have the springs but several crashes (!) and I lost them, so I just a lil offcut of foam now which I think is even better.