I think it is homemade as well... and one thing I did notice is that even with the fork seated on the fork pivot only one of the fork fingers is resting on TO bearing tab. The other fork finger is not even touching the tab on the TO bearing. Which tells me the pivot point needs to be moved closer to the input shaft of the transmission. Doing so should move the fork away from the tube... However I do not know if that will cause other problems with the associated linkage.
standby.
