Servicing/fixing an Ultegra bar end shifter After almost 15 years of flawless service my 8 speed Ultegra bar end shifter has suddenly stopped working.

With the wire detached from the derailleur so there's no tension in it the lever now only moves through 5 clicks.

If I switch it into friction mode the lever seems to be limited to a smaller sweep of motion than the left hand lever. I think they used to move to about the same extent.

Is there anything I can try to get the lever working again? Anything to look for that might explain the symptoms?
There are pawls inside that allow for the clicking of one gear to the next.  After years of service it is quite common for those little pawls to shear from their body and become lodged in between the shift space of two gears.

Even if you free the pawl the shifter will only work in friction mode as the pall will no longer be there to click anymore.

8-speed ultegra should be able to found readily and cheaply.