Fix my own. I just replace the tube and then fix at home. I haven't had a flat this year yet. I've been over 2,000 miles thanks to the marathon + tires.

I always stop and ask if anyone needs help. Stoped and help a rider pump up his MTB tire. It took three cartridges. I think I will buy a pump instead to let them use so they can get a workout. It was then I realized that my inflator only works with presta. Good thing I never got a flat when I was riding my MTB that has Shrader.