I hope you can find a better bike mechanic. You may be able to fix this on your own but next time you have something you can't handle or don't have the tools for it would be good if you had a good mechanic to take your bike to. Clearly this fool is not competent. I'm not a pro but even I would carefully check to see that you had full trim in both directions, particularly if a person brought the bike back to me after I blew it!