I picked up a rather well used flight star 40 from hobbico. It needed some love and of course an ep conversion. Was looking for a nice trainer I could throw skis on.
For any of the turnigy 46-60 size. I use nylon spacers available at Lowe's and home hardware. 8/32 x 3 bolts with blind nuts. You can also get washers with rubber on one side. Good for anti vibration