Skorpion carb linkage

[Grumbly Bearing]

The primary and secondary carbs are joined by a rod/linkage mechanism. Has anyone been able to source a complete mechanism or able to provide info/pics on one they have made for themselves. The parts manuals do not have any references for the complete mechanism, only the lower joint which affixes to the secondary carb - part no. 9020237000 (also 661412602 for the XTZ660). Have tried Graham's in the UK but no luck - same parts manual as me! I feel I should be able to make something that works but if anyone has already done so then any advice or hints would be much appreciated.