Should I replace the Magsafe Adapter?

About a year ago a friend dropped my Macbook on its upper left corner, denting it. Since then, the charging has been quite erratic, and it's getting worse.

Often, I connect the 85w adapter ten or twelve times to start the computer charging. Sometimes the LED turns green, sometimes not, and the battery doesn't charge either way.

Until recently, an orange LED meant success: the computer was charging. Now, it's no guarantee, and sometimes it will charge with no LED at all.

Sometimes (not always) the connection between the charger and magsafe gets quite hot.

I have tried to clean the Magsafe from the outside, which may have improved it a little.

I am looking for a solution that doesn't involve a new computer as the budget is quite tight right now. I have the impression that changing a magsafe is a difficult job.