Stop in for a cup of coffee

I am pretty sure that seal is just for the spedo gear, I do not think the cable has a seal on it. If it is jumping try to pull out the inner drive cable and lube it first, should not be a new cable liner worn out. The other thing I have notice the cables lube seems to wick up to the back of the spedo and gums up the small drive on the back of them. From the spiral on the inner cable acting like a worm drive maybe?