Hi aido i think your better off removing it and putting on a new one .Easy to remove just use a cigerette lighter or a match to heat the runner while holding it with apair of pliers as it heats just twist it off.Give the tip of the rod a bit of a clean up take the old one in and buy a replacment and some 5 minute araldite and glue the new one on.It looks like it is a push on runner i cannot enlarge your picture so im not sure.
Hope this helps Rob