Burrell tractor drawings

[SimonT]

Does anyone have drawings of the speed change components for a Burrell 3sp tractor?

My somewhat autistic son is fascinated with the arrangement, has recently acquired a very worn original low speed pinion, and would like to model the remainder of the mechanism in his 3d modelling package.

If anyone could provide scans of any of the related levers, bracket, forks, pivot pins, etc, it would be really appreciated.

Regards, Simon.