I had recently upgraded from grip shifter to thumb shifter. I have attached the new ST EF50 shifter for my Btwin RR 340vtt. Just today I broke the brake lever from the shifter. I don't want to replace the whole set. I just want to replace the brake lever. is it possible? I have some brake lever which may fit with that. Is that really possible? the brake lever cannot be welded as its an alloy. Do I have any options.