I have always liked the MJT torsion bogie and (given that I need so many) decided to etch my own, incorporating a few changes to make building them quicker.  In the end the center wire was replaced with 2 pins and these merely hold it all together and dont use any form or torsion control at all.  The control now comes from the cross wires between the brake shoes.

These bogies are now available from Brassmasters,click here for more information.