OpenRC truggy steering Pin for 3mm Ball screw with locker

original design for openrc truggy steering pin is not for 3mm? actually it's hard to mount to a 3mm ball,might for 2.5mm ball.

but this design had a easy mount design and built-in locker. verified

b.t.w this stl is generated by python program based on decscad library:
http://www.thingiverse.com/thing:589749