The Surtees 5 speed appears to have the Series D clutch shaft, G3/1 with a shoulder (approx 5/16) between the spline and the clutch nuts fine thread, looks like a Series D style shaft to me (from looking at pictures) and my old G3 is different... Am I correct in thinking I should use the clutch shoe carrier C3/2, seal C18/2 and nut C20/1
Any chance you could post a photo of that shaft showing the 5/16 shoulder?
The VOC Spares site shows G3 being used for series D as well and doesn’t show an updated clutch shaft, yet KTB states that in order to change to the o-ring, you need the updated clutch shaft, carrier, and nut. The fact that it shows a G3 for series D suggests you don’t need those parts, but no idea if that is correct. At this point I’m guessing no It’s not correct. However, if you use a C3/2, then you need the C18/2 and C20/1 to go with it.
edit…. I found the G3/1 updated shaft on the Spares site. It’s a bit weird. If I go into Series D gearbox internals, it doesn’t show the G3/1, but if I do a search for G3/1 it comes up.
dagnabbit…. Your 5/16 shoulder comment tells me that I’m screwed again.