i have just had the gear selector cog in the leg shatter and damage the drive gears..
does anyone have any technical drawings of these parts or even spares of these?
i have access to machines that can make these parts i just need a technical drawing to go by..

the parts i need are numbers 10, 13, 12, 14 on this exploded view..
Click image for larger version. 

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thanks for any help!