When stripped the internal clutch lever was shown to not only be seriously worn but had a piece missing from it as well. You can see in the picture how the lack of the cap and the bearing caused the clutch push rod to wear its way into the lever body. The only thing that stopped it going right through was the hardened steel pin (also worn) that fits through the hole. I tried several places to get a replacement and they are not easily available so a repair job is in order. I will file the wear area back square and then braze in a new piece and re-drill the hole. I will post the result in the next day or so.