Don't it always go that way?
You replace the part known to wear...the cable...and a few week later the big dollah part starts taking a [censored]. I'm kind of surprised that is Ultegra and it broke. That's decent stuff, ordinarily. Meh...all the new [censored] is made from re-cycled milk jugs and condoms these days. I'll have to check and see which [censored] bar-end lever controls the drag brake on mine. It looks similar to yours...
I'm still trying to find time to drive over to the Big City and see if the local shops stock a rear brake cable for that Santana. I'll guarantee you I'll end up online right after the shop monkey spits out the standard, "We don't stock that, but we can order it for you!".
Duh...no thanks. How's about bar-end plugs? You got those?
I can't find my adjustable face pin spanners to turn the elipical BB on the Santana 180°, but made my Campagnolo bomb proof fixed pin spanner work. Someone...probably a short dude, not that I'm pointing fingers at anyone trying to get on a 175 MM crankset!...rotated the front BB spindle close to TDC. It's supposed to be in the bottom 180° of the BB shell to keep the captain's CG lower.
Well, I stood the bike up vertically when done with the cranks straight up & down and man do those pedals look really close to the ground! Note to self: Delay pedaling out of a corner a bit longer than when on your single.