I have just tried to install the GBushing. I am not sure if it is the C109s or just the ones in Australia but it is different to the instructions from Gman. You have to dismantle the left side rider floor board from the bike frame (and crash bar if you have one). Let the floorboard rest just off the bike as it is still attached via the shift cable. You will need a large allen key to undo the bolt (it is larger than the 6mm in the instructions but as I did not have a larger one I can't say what size it is exactly - I will let you know hopefully tomorrow. EDIT: it's an 8mm). Once you undo this it is just a matter of removing the old bushing, putting the new one in place, putting it all back together and voila!
I need to get larger allen keys to remove the bolt so I will let you know when I figure out what size you actually need.
It is not difficult - just different from the instructions. You may find that it only applies to C109s or C109s sold in Australia. Either way I will let Gman know so he can update his instructions.
Keep up the good work Gman
Hoodathunkut