go find a tap that size and re tap the end.
The last thread is bunched up on the next one. How does that thing work?how bad are the threads messed up, if not to bad you can use a thead file to clean them up. Here is a link to a metric thread file at sears <a href="http://www.sears.com/shc/s/p_10153_1260" target="_blank">http://www.sears.com/shc/s/p_10153_1260 ... hread+file</a>