I used TL-01 hingepins (they call them suspension shafts). Tamiya part # 53301
http://www.tamiyausa.com/product/ite...oduct-id=53301
I got mine from rcmart.com
http://www.rcmart.com/catalog/rc-tl0...th=595_744_707
But you got me curious, so I just looked up the downloadable TT-01 manual and they don't use hingepins with e-clips, but an even more primitive method (step screws).